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You searched for +publisher:"University of North Texas" +contributor:("Omary, Mohammad"). Showing records 1 – 30 of 82 total matches.
1. Li, Yun. First Principle Calculations of the Structure and Electronic Properties of Pentacene Based Organic and ZnO Based Inorganic Semiconducting Materials.
► In this thesis, I utilize first principles density functional theory (DFT) based calculations to investigate the structure and electronic properties including charge transfer behaviors and… (more)
▼ In this thesis, I utilize first principles density functional theory (DFT) based calculations to investigate the structure and electronic properties including charge transfer behaviors and work function of two types of materials: pentacene based organic semiconductors and ZnO transparent conducting oxides, with an aim to search for high mobility n-type organic semiconductors and fine tuning work functions of ZnO through surface modifications. Based on DFT calculations of numerous structure combinations, I proposed a pentacene and perfluoro-pentacene alternating hybrid structures as a new type of n-type semiconductor. Based on the DFT calculations and Marcus charge transfer theory analysis, the new structure has high charge mobility and can be a promising new n-type organic semiconductor material. DFT calculations have been used to systematically investigate the effect of surface organic absorbate and surface defects on the work function of ZnO. It was found that increasing surface coverage of organic groups and decreasing surface defects lead to decrease of work functions, in excellent agreement with experimental results. First principles based calculations thus can greatly contribute to the investigating and designing of new electronic materials. Advisors/Committee Members: Du, Jincheng, Shepherd, Nigel, Omary, Mohammad, Xia, Zhenhai.
Subjects/Keywords: Organic semiconductor; pentacene; perflouro-pentacene; inorganic semiconductor; simulation
Li, Y. (2012). First Principle Calculations of the Structure and Electronic Properties of Pentacene Based Organic and ZnO Based Inorganic Semiconducting Materials . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc115112/
Li, Yun. "First Principle Calculations of the Structure and Electronic Properties of Pentacene Based Organic and ZnO Based Inorganic Semiconducting Materials." 2012. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc115112/.
Li, Yun. "First Principle Calculations of the Structure and Electronic Properties of Pentacene Based Organic and ZnO Based Inorganic Semiconducting Materials." 2012. Web. 21 Jan 2020.
Li Y. First Principle Calculations of the Structure and Electronic Properties of Pentacene Based Organic and ZnO Based Inorganic Semiconducting Materials. [Internet] [Thesis]. University of North Texas; 2012. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc115112/.
Li Y. First Principle Calculations of the Structure and Electronic Properties of Pentacene Based Organic and ZnO Based Inorganic Semiconducting Materials. [Thesis]. University of North Texas; 2012. Available from: https://digital.library.unt.edu/ark:/67531/metadc115112/
2. Subbaiyan, Navaneetha Krishnan. Supramolecular Solar Cells.
► Supramolecular chemistry - chemistry of non-covalent bonds including different type of intermolecular interactions viz., ion-pairing, ion-dipole, dipole-dipole, hydrogen bonding, cation-p and Van der Waals forces.… (more)
▼ Supramolecular chemistry - chemistry of non-covalent bonds including different type of intermolecular interactions viz., ion-pairing, ion-dipole, dipole-dipole, hydrogen bonding, cation-p and Van der Waals forces. Applications based on supramolecular concepts for developing catalysts, molecular wires, rectifiers, photochemical sensors have been evolved during recent years. Mimicking natural photosynthesis to build energy harvesting devices has become important for generating energy and solar fuels that could be stored for future use. In this dissertation, supramolecular chemistry is being explored for creating light energy harvesting devices. Photosensitization of semiconductor metal oxide nanoparticles, such as titanium dioxide (TiO2) and tin oxide (SnO2,), via host-guest binding approach has been explored. In the first part, self-assembly of different porphyrin macrocyclic compounds on TiO2 layer using axial coordination approach is explored. Supramolecular dye sensitized solar cells built based on this approach exhibited Incident Photon Conversion Efficiency (IPCE) of 36% for a porphyrin-ferrocene dyad. In the second part, surface modification of SnO2 with water soluble porphyrins and phthalocyanine resulted in successful self-assembly of dimers on SnO2 surface. IPCE more than 50% from 400 - 700 nm is achieved for the supramolecular self-assembled heterodimer photocells is achieved. In summary, the axial ligation and ion-pairing method used as supramolecular tools to build photocells, exhibited highest quantum efficiency of light energy conversion with panchromatic spectral coverage. The reported findings could be applied to create interacting molecular systems for next generation of efficient solar energy harvesting devices. Advisors/Committee Members: D'Souza, Francis, Youngblood, W. Justin, Omary, Mohammad, Shepard, Nigel.
Subjects/Keywords: Supramolecular chemistry; dye sensitized solar cells; water soluble porphyrins
Subbaiyan, N. K. (2012). Supramolecular Solar Cells . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc149672/
Subbaiyan, Navaneetha Krishnan. "Supramolecular Solar Cells." 2012. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc149672/.
Subbaiyan, Navaneetha Krishnan. "Supramolecular Solar Cells." 2012. Web. 21 Jan 2020.
Subbaiyan NK. Supramolecular Solar Cells. [Internet] [Thesis]. University of North Texas; 2012. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc149672/.
Subbaiyan NK. Supramolecular Solar Cells. [Thesis]. University of North Texas; 2012. Available from: https://digital.library.unt.edu/ark:/67531/metadc149672/
3. Salazar Garza, Gustavo Adolfo. Microwave-Assisted Synthesis, Characterization, and Photophysical Properties of New Rhenium(I) Pyrazolyl-Triazine Complexes.
URL: https://digital.library.unt.edu/ark:/67531/metadc28473/
► The reaction of the chelating ligand 4-[4,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazin-2-yl]-N,N-diethyl-benzenamine, L, with pentacarbonylchlororhenium by conventional heating method produces the complexes fac-[ReL(CO)3Cl2] and fac-[Re2L(CO)6Cl2] in a period of 48… (more)
▼ The reaction of the chelating ligand 4-[4,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazin-2-yl]-N,N-diethyl-benzenamine, L, with pentacarbonylchlororhenium by conventional heating method produces the complexes fac-[ReL(CO)3Cl2] and fac-[Re2L(CO)6Cl2] in a period of 48 hours. The use of microwaves as the source of heat and the increase in the equivalents of one of the reactants leads to a more selective reaction and also decreases the reaction time to 1 hour. After proper purification, the photophysical properties of fac-[ReL(CO)3Cl] were analyzed. The solid-state photoluminescence analysis showed an emission band at 628 nm independent of temperature. However, in the solution studies, the emission band shifted from 550 nm in frozen media to 610 nm when the matrix became fluid. These results confirm that this complex possess a phenomenon known as rigidochromism. Advisors/Committee Members: Omary, Mohammad A., Youngblood, W. Justin.
Subjects/Keywords: Microwave-assisted; luminescence; rhenium; synthesis; Rhenium compounds.; Luminescence.; Ligands.
Salazar Garza, G. A. (2010). Microwave-Assisted Synthesis, Characterization, and Photophysical Properties of New Rhenium(I) Pyrazolyl-Triazine Complexes . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc28473/
Salazar Garza, Gustavo Adolfo. "Microwave-Assisted Synthesis, Characterization, and Photophysical Properties of New Rhenium(I) Pyrazolyl-Triazine Complexes." 2010. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc28473/.
Salazar Garza, Gustavo Adolfo. "Microwave-Assisted Synthesis, Characterization, and Photophysical Properties of New Rhenium(I) Pyrazolyl-Triazine Complexes." 2010. Web. 21 Jan 2020.
Salazar Garza GA. Microwave-Assisted Synthesis, Characterization, and Photophysical Properties of New Rhenium(I) Pyrazolyl-Triazine Complexes. [Internet] [Thesis]. University of North Texas; 2010. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc28473/.
Salazar Garza GA. Microwave-Assisted Synthesis, Characterization, and Photophysical Properties of New Rhenium(I) Pyrazolyl-Triazine Complexes. [Thesis]. University of North Texas; 2010. Available from: https://digital.library.unt.edu/ark:/67531/metadc28473/
4. Park, Eunsol. Synthesis of Tethering Group on Borylazadipyrromethene Dyes to Apply to Photogalvanic Dye-sensitized Solar Cells.
► This is my thesis research on the preparation of borylazadipyrromethene (azaBODIPY) dyes bearing an anchoring group, such as a carboxylic acid group, at the β-pyrrolic… (more)
▼ This is my thesis research on the preparation of borylazadipyrromethene (azaBODIPY) dyes bearing an anchoring group, such as a carboxylic acid group, at the β-pyrrolic position of the azadipyrromethene scaffold. Carboxylate groups form covalent bonds to oxide semiconductors such as TiO2 (n-type) or Cu2O (p-type) in dye-sensitized solar cells (DSCs) or photogalvanic dye-sensitized solar cells (P-DSCs). Oxide-binding azaBODIPY dyes can be used to investigate the rate and mechanism of electron injection from the dyes to the semiconductors. Two different types of azaBODIPY (difluoroboryl and dialkynylboryl) were prepared by following previously developed methods. To convert difluoroborylazaBODIPY to the final dyes having a carboxylic acid in the β-pyrrolic position, several distinct synthetic routes were designed, adopting various reactions, such as halogenation, Sonogashira coupling, Knoevenagel condensation, Grignard reagents, Vilsmeir-Haack, and Steglich esterification. Some of these reactions were successful, but the overall synthesis to the targeted final molecule couldn't be accomplished. Even though further studies on the synthesis of oxide-binding azaBODIPYs are needed, at least my thesis research suggests what reactions can be implemented to complete this synthesis in the future. Proton NMR (nuclear magnetic resonance) and carbon NMR were commonly used to confirm the synthesized compounds, and sometimes crystallographic information was obtained by XRD (X-ray diffraction) whenever crystals of sufficient size and quality were grown. NMR spectra, interpreted by SpinWorks 3 software, and crystal structures will be introduced in each chapter. Advisors/Committee Members: Youngblood, W. Justin, Richmond, Michael G., Omary, Mohammad A..
Subjects/Keywords: photogalvanic dye-sensitized solar cells; azadipyrromethene dyes; synthesis of anchoring group; Metal oxide semiconductors.; Semiconductors – Bonding.; Dye-sensitized solar cells.; Carboxylic acids.
Park, E. (2014). Synthesis of Tethering Group on Borylazadipyrromethene Dyes to Apply to Photogalvanic Dye-sensitized Solar Cells . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc700072/
Park, Eunsol. "Synthesis of Tethering Group on Borylazadipyrromethene Dyes to Apply to Photogalvanic Dye-sensitized Solar Cells." 2014. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc700072/.
Park, Eunsol. "Synthesis of Tethering Group on Borylazadipyrromethene Dyes to Apply to Photogalvanic Dye-sensitized Solar Cells." 2014. Web. 21 Jan 2020.
Park E. Synthesis of Tethering Group on Borylazadipyrromethene Dyes to Apply to Photogalvanic Dye-sensitized Solar Cells. [Internet] [Thesis]. University of North Texas; 2014. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc700072/.
Park E. Synthesis of Tethering Group on Borylazadipyrromethene Dyes to Apply to Photogalvanic Dye-sensitized Solar Cells. [Thesis]. University of North Texas; 2014. Available from: https://digital.library.unt.edu/ark:/67531/metadc700072/
5. Halbert, Jason Paul. A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices.
► The characterization of 2,3,6,7,10,11-hexabromotriphenylene, Br6TP, is presented toward its potential use as an n-type organic semiconductor and metal-free room temperature phosphor. The crystal structure shows… (more)
▼ The characterization of 2,3,6,7,10,11-hexabromotriphenylene, Br6TP, is presented toward its potential use as an n-type organic semiconductor and metal-free room temperature phosphor. The crystal structure shows both anisotropic two-dimensional BrBr interactions and inter-layer ?-stacking interactions. Photophysical characteristics were evaluated using solid-state photoluminescence and diffuse reflectance spectroscopies, revealing significantly red-shifted excitations in the visible region for the yellow solid material (compared to ultraviolet absorption bands for the colorless dilute solutions). Correlation of spectral, electrochemical, and computational data suggest the presence of an n-type semiconducting behavior due to the electron-poor aromatic ring. The material shows excellent thermal stability as demonstrated by thermogravimetric analysis and infrared spectra of a thin film deposited by thermal evaporation. The potential for Br6TP and its analogues toward use in several types of photonic and electronic devices is discussed. Advisors/Committee Members: Omary, Mohammad A., D'Souz, Francis, Youngblood, W. Justin.
Subjects/Keywords: Optoelectronic devices; metal free; organic; phosphour triphenylene
Halbert, J. P. (2012). A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc177207/
Halbert, Jason Paul. "A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices." 2012. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc177207/.
Halbert, Jason Paul. "A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices." 2012. Web. 21 Jan 2020.
Halbert JP. A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices. [Internet] [Thesis]. University of North Texas; 2012. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc177207/.
Halbert JP. A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices. [Thesis]. University of North Texas; 2012. Available from: https://digital.library.unt.edu/ark:/67531/metadc177207/
6. Oswald, Iain William Herbert. Design, Synthesis and Screening of Homoleptic and Heteroleptic Platinum(ii) Pyridylazolate Complexes for N-type Semiconducting and Light-emitting Devices.
► A series of heteroleptic and homoleptic platinum(II) complexes has been synthesized and characterized towards their use in thin film devices such as organic light-emitting diodes… (more)
▼ A series of heteroleptic and homoleptic platinum(II) complexes has been synthesized and characterized towards their use in thin film devices such as organic light-emitting diodes (OLEDs) and organic thin film transistors (OTFTs). Pyridylpyrazolate- and pyridyltetrazolate-containing ligands were selected due to their structural rigidity and ease of functionalization. Single-crystal x-ray diffraction studies of two selected heteroleptic complexes show strong aggregation with preferential stacking into vertical columns with a varying degree of overlap of the neighboring square planar molecular units. It is shown that the close proximity of the molecules to one another in the stack increases semiconducting character, phosphorescence quantum yields, and shorter radiative lifetimes. The potential for these materials towards incorporation into high-efficiency doping free white OLEDs (DFW-OLEDs) for solid-state lighting and display applications has been realized and will be expanded upon by present and future embodiments of materials in this thesis. Advisors/Committee Members: Omary, Mohammad A., Youngblood, W. Justin.
Subjects/Keywords: OLED; phosphor; semiconductor; n-type; platinum
Oswald, I. W. H. (2012). Design, Synthesis and Screening of Homoleptic and Heteroleptic Platinum(ii) Pyridylazolate Complexes for N-type Semiconducting and Light-emitting Devices . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc283853/
Oswald, Iain William Herbert. "Design, Synthesis and Screening of Homoleptic and Heteroleptic Platinum(ii) Pyridylazolate Complexes for N-type Semiconducting and Light-emitting Devices." 2012. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc283853/.
Oswald, Iain William Herbert. "Design, Synthesis and Screening of Homoleptic and Heteroleptic Platinum(ii) Pyridylazolate Complexes for N-type Semiconducting and Light-emitting Devices." 2012. Web. 21 Jan 2020.
Oswald IWH. Design, Synthesis and Screening of Homoleptic and Heteroleptic Platinum(ii) Pyridylazolate Complexes for N-type Semiconducting and Light-emitting Devices. [Internet] [Thesis]. University of North Texas; 2012. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc283853/.
Oswald IWH. Design, Synthesis and Screening of Homoleptic and Heteroleptic Platinum(ii) Pyridylazolate Complexes for N-type Semiconducting and Light-emitting Devices. [Thesis]. University of North Texas; 2012. Available from: https://digital.library.unt.edu/ark:/67531/metadc283853/
7. Kumar, Siddhartha. Synthesis and Characterization of π-Extended Benzoporphyrins.
URL: https://digital.library.unt.edu/ark:/67531/metadc1505216/
► Porphyrins offer a very synthetically flexible template which can be modified in numerous ways to synthesize molecules with very useful properties applicable in areas such… (more)
▼ Porphyrins offer a very synthetically flexible template which can be modified in numerous ways to synthesize molecules with very useful properties applicable in areas such as non-linear optical properties, photodynamic therapy, dye-sensitized solar cells, chemical sensors and organic electronic devices. β-Substituted π-extended porphyrins offer unique capabilities in tuning the properties of the molecule towards practical applications. Increased π-conjugation allows the HOMO-LUMO gap to decrease and hence to redshift the absorption into the near-IR region. β-Fused benzoporphyrins offer additional benefits in which the benzene ring itself can be further modified using electron donating substituents and electron donating substituents to electronically tune these porphyrins for various uses. The goal of the research pursued in this dissertation was to develop new methods for the development of β-Substituted π-extended porphyrins and to study their optical and electronic properties. To accomplish this goal, we developed new method to synthesize A2B2 type tetrabenzoporphyrins and we studied the electron transfer in such systems. We also studied the effectiveness of such systems in dye sensitized solar cells. A new method to synthesize functionalized naphthalene fused porphyrins was also developed and we were also able to use this method to synthesize a push-pull naphthalene fused porphyrin. Advisors/Committee Members: Wang, Hong, D'Souza, Francis, Omary, Mohammad, Slaughter, LeGrande, Hartley, Scott.
Subjects/Keywords: Benzoporphyrins; Naphthoporphyrins
Kumar, S. (2019). Synthesis and Characterization of π-Extended Benzoporphyrins . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1505216/
Kumar, Siddhartha. "Synthesis and Characterization of π-Extended Benzoporphyrins." 2019. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc1505216/.
Kumar, Siddhartha. "Synthesis and Characterization of π-Extended Benzoporphyrins." 2019. Web. 21 Jan 2020.
Kumar S. Synthesis and Characterization of π-Extended Benzoporphyrins. [Internet] [Thesis]. University of North Texas; 2019. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1505216/.
Kumar S. Synthesis and Characterization of π-Extended Benzoporphyrins. [Thesis]. University of North Texas; 2019. Available from: https://digital.library.unt.edu/ark:/67531/metadc1505216/
8. Salazar Garza, Gustavo Adolfo. Microwave-Assisted Synthesis and Photophysical Properties of Poly-Imine Ambipolar Ligands and Their Rhenium(I) Carbonyl Complexes.
► The phenomenon luminescence rigidochromism has been reported since the 1970s in tricarbonyldiimine complexes with a general formula [R(CO)3LX] using conventional unipolar diimine ligands such as… (more)
▼ The phenomenon luminescence rigidochromism has been reported since the 1970s in tricarbonyldiimine complexes with a general formula [R(CO)3LX] using conventional unipolar diimine ligands such as 2,2;-bipyridine or 1,10-phenanthroline as L, and halogens or simple solvents as X. As a major part of this dissertation, microwave-assisted synthesis, purification, characterization and detailed photoluminescence studies of the complex fac-[ReCl(CO)3L], 1, where L = 4-[4,6-bis(3,5-dimethyl-1H-pyrazol-1-yl]-N,N-diethylbenzenamine are reported. The employment of microwaves in the preparation of 1 decreased the reaction time from 48 to 2 hours compared to the conventional reflux method. Stoichiometry variations allows for selective preparation of either a mononuclear, 1, or binuclear, fac-[Re2Cl2(CO)6], 2, complex. The photophysical properties of 1 were analyzed finding that it possesses significant luminescence rigidochromism. The steady state photoluminescence emission spectra of 1 in solution shift from 550 nm in frozen media to 610 nm when the matrix becomes fluid. Moreover, a very sensitive emission spectral analysis of 0.1 K temperatures steps shows a smooth transition through the glass transition temperature of the solvent host. Furthermore, synthetic modifications to L have attained a family of ambipolar compounds that have tunable photophysical, thermophysical and other material properties that render them promising candidates for potential applications in organic electronics and/or sensors - either as is or for their future complexes with various transition metals and lanthanides. Advisors/Committee Members: Omary, Mohammad A, Richmond, Michael G, D'Souza, Francis, Reidy, Richard F.
Subjects/Keywords: Luminescence; Rigidochromism; Microwave; Fluorescence; Phosphorescence
Salazar Garza, G. A. (2017). Microwave-Assisted Synthesis and Photophysical Properties of Poly-Imine Ambipolar Ligands and Their Rhenium(I) Carbonyl Complexes . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1011818/
Salazar Garza, Gustavo Adolfo. "Microwave-Assisted Synthesis and Photophysical Properties of Poly-Imine Ambipolar Ligands and Their Rhenium(I) Carbonyl Complexes." 2017. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc1011818/.
Salazar Garza, Gustavo Adolfo. "Microwave-Assisted Synthesis and Photophysical Properties of Poly-Imine Ambipolar Ligands and Their Rhenium(I) Carbonyl Complexes." 2017. Web. 21 Jan 2020.
Salazar Garza GA. Microwave-Assisted Synthesis and Photophysical Properties of Poly-Imine Ambipolar Ligands and Their Rhenium(I) Carbonyl Complexes. [Internet] [Thesis]. University of North Texas; 2017. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1011818/.
Salazar Garza GA. Microwave-Assisted Synthesis and Photophysical Properties of Poly-Imine Ambipolar Ligands and Their Rhenium(I) Carbonyl Complexes. [Thesis]. University of North Texas; 2017. Available from: https://digital.library.unt.edu/ark:/67531/metadc1011818/
9. Bodenstedt, Kurt. Synthesis and Electron Transfer Studies of Supramolecular Triads.
► This study expands the role of polythiophenes as an electron donating chromophore within energy harvesting milti-modular donor-acceptor systems. The polythiophene moiety would act as an… (more)
▼ This study expands the role of polythiophenes as an electron donating chromophore within energy harvesting milti-modular donor-acceptor systems. The polythiophene moiety would act as an electron donating spacer group between the donor and acceptor entities, viz., phenothiazine and fulleropyrrolidine, respectively, in the newly synthesized supramolecular triads. The triads 10-{[2,2';5',2"] terthiophene-5-fulleropyrrolidine} phenothiazine and 10-{[2,2'] bithiophene-5-fulleropyrrolidine} phenothiazine were synthesized and characterized through electrochemical and spectroscopic methods to ascertain their structural integrity. the componets of the triads were selected for their established redox parameters. Phenothiazine would act as a secondary donor and would facilitate hole-transfer from the polythiophene primary electron donor, due to its ease of oxidation and yield a long-lived charge separated state. Fulleropyrrolidine would act as an acceptor for ease of reductive capabilities and its ability to hold multiple charges. Finally, occurrence of photoinduced electron transferleading to the anticipated charge separated states is established from advanced transient spectroscopic techniques on these novel supramolecular systems. Advisors/Committee Members: D'Souza, Francis, Acree, William E. (William Eugene), Schwartz, Martin, Omary, Mohammad.
Subjects/Keywords: polythiophene; photoinduced electron transfer
Bodenstedt, K. (2016). Synthesis and Electron Transfer Studies of Supramolecular Triads . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc849639/
Bodenstedt, Kurt. "Synthesis and Electron Transfer Studies of Supramolecular Triads." 2016. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc849639/.
Bodenstedt, Kurt. "Synthesis and Electron Transfer Studies of Supramolecular Triads." 2016. Web. 21 Jan 2020.
Bodenstedt K. Synthesis and Electron Transfer Studies of Supramolecular Triads. [Internet] [Thesis]. University of North Texas; 2016. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc849639/.
Bodenstedt K. Synthesis and Electron Transfer Studies of Supramolecular Triads. [Thesis]. University of North Texas; 2016. Available from: https://digital.library.unt.edu/ark:/67531/metadc849639/
10. Ivy, Joshua F. Optoelectronically Active Metal-Inorganic Frameworks and Supramolecular Extended Solids.
► Metal-organic frameworks (MOFs) have been intensely researched over the past 20 years. In this dissertation, metal-inorganic frameworks (MIFs), a new class of porous and nonporous… (more)
▼ Metal-organic frameworks (MOFs) have been intensely researched over the past 20 years. In this dissertation, metal-inorganic frameworks (MIFs), a new class of porous and nonporous materials using inorganic complexes as linkers, in lieu of traditional organic linkers in MOFs is reported. Besides novel MIF regimes, the previously described fluorous MOF "FMOF-1", is re-categorized herein as "F-MIF1". F-MIF-1 is comprised of [Ag4Tz6]2- (Tz = 3,5-bis-trifluoromethyl-1,2,4-triazolate) inorganic clusters connected by 3-coordinate Ag+ metal centers. Chapter 2 describes isosteric heat of adsorption studies of F-MIF1 for CO2 at near ambient temperatures, suggesting promise for carbon capture and storage. We then successfully exchanged some of these Ag(I) centers with Au(I) to form an isostructural Au/F-MIF1. Other, nonporous MIFs have been synthesized using Ag2Tz2 clusters with bridging diamine linkers 4,4'-bipyridine, pyrazine, and a Pt(II) complex containing two oppositely-situated non-coordinating pyridines. This strategy attained luminescent products better-positioned for photonic devices than porous materials due to greater exciton density. Chapter 3 overviews work using an entirely inorganic luminescent complex, [Pt2(P2O5)4]4- (a.k.a. "PtPOP") to form new carbon-free MIFs. PtPOP is highly luminescent in solution, but as a solid shows poor quantum yield (QY ~0.02) and poor stability under ambient conditions. By complexing PtPOP to various metals, we have shown a dramatic enhancement in its solid-state luminescence (by an order of magnitude) and stability (from day to year scale). One embodiment (MIF-1) demonstrates microporous character. Chapter 4 overviews the design and application of new MIF linkers. Pt complexes based upon (pyridyl)azolates, functionalized with carboxylic acid groups, have been synthesized. These complexes, and their esterized precursors, show strong luminescence on their own. They have been used to generate new luminescent MIFs. Such new MIFs may be useful toward future inorganic (LEDs) or organic (OLEDs) light-emitting diodes, respectively. The electronic communication along their infinite coordination structures is desirable for color tuning and enhanced conductivity functions, compared to the small molecules used in such technologies, which rely on intermolecular interactions for these functions. Advisors/Committee Members: Omary, Mohammad, D'Souza, Francis, Hunka, Deborah, Slaughter, Legrande, Wang, Hong.
Subjects/Keywords: Metal-Organic Frameworks; MOF; MIF; Luminescent; Luminescence; coordination polymer
Ivy, J. F. (2018). Optoelectronically Active Metal-Inorganic Frameworks and Supramolecular Extended Solids . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1248495/
Ivy, Joshua F. "Optoelectronically Active Metal-Inorganic Frameworks and Supramolecular Extended Solids." 2018. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc1248495/.
Ivy, Joshua F. "Optoelectronically Active Metal-Inorganic Frameworks and Supramolecular Extended Solids." 2018. Web. 21 Jan 2020.
Ivy JF. Optoelectronically Active Metal-Inorganic Frameworks and Supramolecular Extended Solids. [Internet] [Thesis]. University of North Texas; 2018. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1248495/.
Ivy JF. Optoelectronically Active Metal-Inorganic Frameworks and Supramolecular Extended Solids. [Thesis]. University of North Texas; 2018. Available from: https://digital.library.unt.edu/ark:/67531/metadc1248495/
11. McDougald, Roy N., Jr. Photochemical and Photophysical Properties of Mononuclear and Multinuclear Closed Shell D10 Coinage Metal Complexes and Their Metallo-organometallic Adducts.
► This dissertation covers the studies of two major topics: the photochemistry of mononuclear and multinuclear gold(I) complexes and synthetic approaches to tailor photophysical properties of… (more)
▼ This dissertation covers the studies of two major topics: the photochemistry of mononuclear and multinuclear gold(I) complexes and synthetic approaches to tailor photophysical properties of cyclic trinuclear d10 complexes. First a detailed photochemical examination into the photoreactivity of neutral mononuclear and multinuclear gold(I) complexes is discussed, with the aim of gold nanoparticle size and shape control for biomedical and catalysis applications. Next is a comprehensive systematic synthetic approach to tailor the photophysical properties of cyclic trinuclear d10 complexes. This synthetic approach includes an investigation of structure-luminescence relationships between cyclic trinuclear complexes, an examination into their π-acid/π-base reactivity with heavy metal cations and an exploration into the photophysical properties of new heterobimetallic cyclic trinuclear complexes. These photophysical properties inspections are used to screen materials for their employment in molecular electronic devices such as organic light-emitting diodes (OLEDs) and thin film transistors (OTFTs). Advisors/Committee Members: Omary, Mohammad A., Cundari, Thomas R., Richmond, Michael G., Kelber, Jeffery.
Subjects/Keywords: Organometallic; trinuclear gold complex; π-acid/π-base adducts; aurophilicity; heterobimetallic
McDougald, Roy N., J. (2013). Photochemical and Photophysical Properties of Mononuclear and Multinuclear Closed Shell D10 Coinage Metal Complexes and Their Metallo-organometallic Adducts . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc407759/
McDougald, Roy N., Jr. "Photochemical and Photophysical Properties of Mononuclear and Multinuclear Closed Shell D10 Coinage Metal Complexes and Their Metallo-organometallic Adducts." 2013. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc407759/.
McDougald, Roy N., Jr. "Photochemical and Photophysical Properties of Mononuclear and Multinuclear Closed Shell D10 Coinage Metal Complexes and Their Metallo-organometallic Adducts." 2013. Web. 21 Jan 2020.
McDougald, Roy N. J. Photochemical and Photophysical Properties of Mononuclear and Multinuclear Closed Shell D10 Coinage Metal Complexes and Their Metallo-organometallic Adducts. [Internet] [Thesis]. University of North Texas; 2013. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc407759/.
McDougald, Roy N. J. Photochemical and Photophysical Properties of Mononuclear and Multinuclear Closed Shell D10 Coinage Metal Complexes and Their Metallo-organometallic Adducts. [Thesis]. University of North Texas; 2013. Available from: https://digital.library.unt.edu/ark:/67531/metadc407759/
12. Harris, Alesha N. Synthesis and Characterization of Copper Releasing Polymer Nanoparticles.
► Polymeric nanoparticles were synthesized and loaded with Cu²⁺ to explore the therapeutic potential for catically active transition metal ions and complexes other than cisplatin. Two… (more)
▼ Polymeric nanoparticles were synthesized and loaded with Cu²⁺ to explore the therapeutic potential for catically active transition metal ions and complexes other than cisplatin. Two types of nanoparticles were synthesized to show the potential for polymer based vectors. Copper loading and release were characterized via inductively coupled plasma mass spectrometry (ICP MS), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and elemental analysis. Results demonstrated that Cu could be loaded to the nano-sized carriers in an aqueous environment, and that the release was pH-dependent. The toxicity of these particles was measured in HeLa cells where significant toxicity was observed in vitro via dosing of high Cu-loaded nanoparticles. No significant toxicity was observed in cells dosed with Cu-free nanoparticles. Advisors/Committee Members: Petros, Robby A., Omary, Mohammad, Acree, William E. (William Eugene).
Subjects/Keywords: Inorganic chemistry; cytotoxicity; mass spectrometry; inductively coupled plasma; copper; nanoparticles
Harris, A. N. (2011). Synthesis and Characterization of Copper Releasing Polymer Nanoparticles . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc67990/
Harris, Alesha N. "Synthesis and Characterization of Copper Releasing Polymer Nanoparticles." 2011. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc67990/.
Harris, Alesha N. "Synthesis and Characterization of Copper Releasing Polymer Nanoparticles." 2011. Web. 21 Jan 2020.
Harris AN. Synthesis and Characterization of Copper Releasing Polymer Nanoparticles. [Internet] [Thesis]. University of North Texas; 2011. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc67990/.
Harris AN. Synthesis and Characterization of Copper Releasing Polymer Nanoparticles. [Thesis]. University of North Texas; 2011. Available from: https://digital.library.unt.edu/ark:/67531/metadc67990/
13. Laury, Marie L. Accurate and Reliable Prediction of Energetic and Spectroscopic Properties Via Electronic Structure Methods.
► Computational chemistry has led to the greater understanding of the molecular world, from the interaction of molecules, to the composition of molecular species and materials.… (more)
▼ Computational chemistry has led to the greater understanding of the molecular world, from the interaction of molecules, to the composition of molecular species and materials. Of the families of computational chemistry approaches available, the main families of electronic structure methods that are capable of accurate and/or reliable predictions of energetic, structural, and spectroscopic properties are ab initio methods and density functional theory (DFT). The focus of this dissertation is to improve the accuracy of predictions and computational efficiency (with respect to memory, disk space, and computer processing time) of some computational chemistry methods, which, in turn, can extend the size of molecule that can be addressed, and, for other methods, DFT, in particular, gain greater insight into which DFT methods are more reliable than others. Much, though not all, of the focus of this dissertation is upon transition metal species – species for which much less method development has been targeted or insight about method performance has been well established. The ab initio approach that has been targeted in this work is the correlation consistent composite approach (ccCA), which has proven to be a robust, ab initio computational method for main group and first row transition metal-containing molecules yielding, on average, accurate thermodynamic properties, i.e., within 1 kcal/mol of experiment for main group species and within 3 kcal/mol of experiment for first row transition metal molecules. In order to make ccCA applicable to systems containing any element from the periodic table, development of the method for second row transition metals and heavier elements, including lower p-block (5p and 6p) elements was pursued. The resulting method, the relativistic pseudopotential variant of ccCA (rp-ccCA), and its application are detailed for second row transition metals and lower p-block elements. Because of the computational cost of ab initio methods, DFT is a popular choice for the study of transition metals. Despite this, the most reliable density functionals for the prediction of energetic properties (e.g. enthalpy of formation, ionization potential, electron affinity, dissociation energy) of transition metal species, have not been clearly identified. The examination of DFT performance for first and second row transition metal thermochemistry (i.e., enthalpies of formation) was conducted and density functionals for the study of these species were identified. And, finally, to address the accuracy of spectroscopic and energetic properties, improvements for a series of density functionals have been established. In both DFT and ab initio methods, the harmonic approximation is typically employed. This neglect of anharmonic effects, such as those related to vibrational properties (e.g. zero-point vibrational energies, thermal contributions to enthalpy and entropy) of molecules, generally results in computational predictions that are not in agreement with experiment. To correct for the neglect of anharmonicity,… Advisors/Committee Members: Wilson, Angela K., Cundari, Thomas R., Marshall, Paul, 1960-, Omary, Mohammad.
Subjects/Keywords: Ab initio; density functional theory; transition metal; computational chemistry
Laury, M. L. (2013). Accurate and Reliable Prediction of Energetic and Spectroscopic Properties Via Electronic Structure Methods . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc500071/
Laury, Marie L. "Accurate and Reliable Prediction of Energetic and Spectroscopic Properties Via Electronic Structure Methods." 2013. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc500071/.
Laury, Marie L. "Accurate and Reliable Prediction of Energetic and Spectroscopic Properties Via Electronic Structure Methods." 2013. Web. 21 Jan 2020.
Laury ML. Accurate and Reliable Prediction of Energetic and Spectroscopic Properties Via Electronic Structure Methods. [Internet] [Thesis]. University of North Texas; 2013. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc500071/.
Laury ML. Accurate and Reliable Prediction of Energetic and Spectroscopic Properties Via Electronic Structure Methods. [Thesis]. University of North Texas; 2013. Available from: https://digital.library.unt.edu/ark:/67531/metadc500071/
14. Conrad, Heidi Ann. Electrochemically Deposited Metal Alloy-silicate Nanocomposite Corrosion Resistant Materials.
► Zinc-nickel ?-phase silicate and copper-nickel silicate corrosion resistant coatings have been prepared via electrochemical methods to improve currently available corrosion resistant materials in the oil… (more)
▼ Zinc-nickel ?-phase silicate and copper-nickel silicate corrosion resistant coatings have been prepared via electrochemical methods to improve currently available corrosion resistant materials in the oil and gas industry. A layered silicate, montmorillonite, has been incorporated into the coatings for increased corrosion protection. For the zinc nickel silicate coatings, optimal plating conditions were determined to be a working pH range of 9.3 -9.5 with a borate based electrolyte solution, resulting in more uniform deposits and better corrosion protection of the basis metal as compared to acidic conditions. Quality, strongly adhering deposits were obtained quickly with strong, even overall coverage of the metal substrate. The corrosion current of the zinc-nickel-silicate coating is Icorr = 3.33E-6 for a borate based bath as compared to a zinc-nickel bath without silicate incorporation (Icorr = 3.52E-5). Step potential and direct potential methods were examined, showing a morphological advantage to step potential deposition. The effect of borate addition was examined in relation to zinc, nickel and zinc-nickel alloy deposition. Borate was found to affect the onset of hydrogen evolution and was examined for absorption onto the electrode surface. For copper-nickel silicate coatings, optimal conditions were determined to be a citrate based electrolytic bath, with pH = 6. The solutions were stable over time and strong adhering, compact particle deposits were obtained. The corrosion current of the copper-nickel-silicate coatings is Icorr = 3.86E-6 (copper-nickel coatings without silicate, Icorr = 1.78E-4). The large decrease in the corrosion current as the silicate is incorporated into the coating demonstrates the increase in corrosion resistance of the coatings with the incorporation of silicates. Advisors/Committee Members: Golden, Teresa D., Chyan, Oliver M.R., Omary, Mohammad, Youngblood, W. Justin.
Subjects/Keywords: Zinc-nickel alloy; copper-nickel alloy; metal-silicate coatings; corrosion resistant coatings
Conrad, H. A. (2013). Electrochemically Deposited Metal Alloy-silicate Nanocomposite Corrosion Resistant Materials . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc271794/
Conrad, Heidi Ann. "Electrochemically Deposited Metal Alloy-silicate Nanocomposite Corrosion Resistant Materials." 2013. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc271794/.
Conrad, Heidi Ann. "Electrochemically Deposited Metal Alloy-silicate Nanocomposite Corrosion Resistant Materials." 2013. Web. 21 Jan 2020.
Conrad HA. Electrochemically Deposited Metal Alloy-silicate Nanocomposite Corrosion Resistant Materials. [Internet] [Thesis]. University of North Texas; 2013. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc271794/.
Conrad HA. Electrochemically Deposited Metal Alloy-silicate Nanocomposite Corrosion Resistant Materials. [Thesis]. University of North Texas; 2013. Available from: https://digital.library.unt.edu/ark:/67531/metadc271794/
15. Khani, Sarah Karbalaei. Exploring Inorganic Catalysis with Electronic Structure Simulations.
► Organometallic catalysis has attracted significant interest from both industry and academia due to its wide applications in organic synthetic transformations. Example of such transformations include… (more)
▼ Organometallic catalysis has attracted significant interest from both industry and academia due to its wide applications in organic synthetic transformations. Example of such transformations include the reaction of a zinc carbenoid with olefins to form cyclopropanes. The first project is a computational study using both density functional and correlated wavefunction methods of the reaction between ethylene and model zinc carbenoid, nitrenoid and oxenoid complexes (L-Zn-E-X, E = CH2, NH or O, L = X = I or Cl). It was shown that cyclopropanation of ethylene with IZnCH2I and aziridination of ethylene with IZnNHI proceed via a single-step mechanism with an asynchronous transition state. The reaction barrier for the aziridination with IZnNHI is lower than that of cyclopropanation. Changing the leaving group of IZnNHI from I to Cl, changes the mechanism of the aziridination reaction to a two-step pathway. The calculation results from the epoxidation with IZnOI and ClZnOCl oxenoids suggest a two-step mechanism for both oxenoids. Another important example of organometallic catalysis is the formation of alkyl arenes from arenes and olefins using transition metal catalysis (olefin hydroarylation). We studied with DFT methods the mechanism of a novel Rh catalyst (FlDAB)Rh(TFA)(η2–C2H4) [FlDAB = N,N' -bis(pentafluorophenyl)-2,3-dimethyl-1,4-diaza-1,3-butadiene; TFA = trifluoroacetate] that converts benzene, ethylene and air-recyclable Cu(II) oxidants to styrene. Possible mechanisms are discussed. Advisors/Committee Members: Cundari, Thomas R., 1964-, Schwartz, Martin, Omary, Mohammad A., 1969-.
Subjects/Keywords: Carbenoid; Nitrenoid; Oxenoid; Chemistry, Inorganic.; Nitrenes.; Carbenes (Methylene compounds); Catalysis.; Organometallic chemistry.
Khani, S. K. (2016). Exploring Inorganic Catalysis with Electronic Structure Simulations . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc849685/
Khani, Sarah Karbalaei. "Exploring Inorganic Catalysis with Electronic Structure Simulations." 2016. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc849685/.
Khani, Sarah Karbalaei. "Exploring Inorganic Catalysis with Electronic Structure Simulations." 2016. Web. 21 Jan 2020.
Khani SK. Exploring Inorganic Catalysis with Electronic Structure Simulations. [Internet] [Thesis]. University of North Texas; 2016. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc849685/.
Khani SK. Exploring Inorganic Catalysis with Electronic Structure Simulations. [Thesis]. University of North Texas; 2016. Available from: https://digital.library.unt.edu/ark:/67531/metadc849685/
16. Fallah, Hengameh. Reductive Functionalization of 3D Metal-Methyl Complexes and Characterization of a Novel Dinitrogen Dicopper (I) Complex.
► Reductive functionalization of methyl ligands by 3d metal catalysts and two possible side reactions has been studied. Selective oxidation of methane, which is the primary… (more)
▼ Reductive functionalization of methyl ligands by 3d metal catalysts and two possible side reactions has been studied. Selective oxidation of methane, which is the primary component of natural gas, to methanol (a more easily transportable liquid) using organometallic catalysis, has become more important due to the abundance of domestic natural gas. In this regard, reductive functionalization (RF) of methyl ligands in [M(diimine)2(CH3)(Cl)] (M: VII (d3) through CuII (d9)) complexes, has been studied computationally using density functional techniques. A SN2 mechanism for the nucleophilic attack of hydroxide on the metal-methyl bond, resulting in the formation of methanol, was studied. Similar highly exergonic pathways with very low energy SN2 barriers were observed for the proposed RF mechanism for all complexes studied. To modulate RF pathways closer to thermoneutral for catalytic purposes, a future challenge, paradoxically, requires finding a way to strengthen the metal-methyl bond. Furthermore, DFT calculations suggest that for 3d metals, ligand properties will be of greater importance than metal identity in isolating suitable catalysts for alkane hydroxylation in which reductive functionalization is used to form the C—O bond. Two possible competitive reactions for RF of metal-methyl complexes were studied to understand the factors that lower the selectivity of C—O bond forming reactions. One of them was deprotonation of the methyl group, which leads to formation of a methylene complex and water. The other side reaction was metal-methyl bond dissociation, which was assessed by calculating the bond dissociation free energies of M3d—CH3 bonds. Deprotonation was found to be competitive kinetically for most of the 1st row transition metal-methyl complexes (except for CrII, MnII and CuII), but less favorable thermodynamically as compared to reductive functionalization for all of the studied 1st row transition metal complexes. Metal-carbon bond dissociation was found to be less favorable than the RF reactions for most 3d transition metal complexes studied. The first dinitrogen dicopper (I) complex has been characterized using computational and experimental methods. Low temperature reaction of the tris(pyrazolyl)borate copper(II) hydroxide {iPr2TpCu}2(µ-OH)2 with triphenylsilane under a dinitrogen atmosphere gives the µ -N2 complex, {iPr2TpCu}2(µ -N2). X-ray crystallography reveals an only slightly activated N2 ligand (N-N: 1.111(6) Å) that bridges between two iPr2TpCuI fragments. While DFT studies of mono- and dinuclear copper dinitrogen complexes suggest a weak µ-backbonding between the d10 CuI centers and the N2 ligand, they reveal a degree of cooperativity in the dinuclear Cu-N2-Cu interaction. Advisors/Committee Members: Cundari, Thomas R., Omary, Mohammad A., Slaughter, LeGrande M, Cisneros, Andrés, Gassensmith, Jeremiah J.
Subjects/Keywords: Reductive Functionalization; Organometallics; Methanol; Deprotonation; Computational Chemistry; Dinitrogen Complex; Catalysis
Fallah, H. (2017). Reductive Functionalization of 3D Metal-Methyl Complexes and Characterization of a Novel Dinitrogen Dicopper (I) Complex . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc984200/
Fallah, Hengameh. "Reductive Functionalization of 3D Metal-Methyl Complexes and Characterization of a Novel Dinitrogen Dicopper (I) Complex." 2017. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc984200/.
Fallah, Hengameh. "Reductive Functionalization of 3D Metal-Methyl Complexes and Characterization of a Novel Dinitrogen Dicopper (I) Complex." 2017. Web. 21 Jan 2020.
Fallah H. Reductive Functionalization of 3D Metal-Methyl Complexes and Characterization of a Novel Dinitrogen Dicopper (I) Complex. [Internet] [Thesis]. University of North Texas; 2017. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc984200/.
Fallah H. Reductive Functionalization of 3D Metal-Methyl Complexes and Characterization of a Novel Dinitrogen Dicopper (I) Complex. [Thesis]. University of North Texas; 2017. Available from: https://digital.library.unt.edu/ark:/67531/metadc984200/
17. Ghimire, Mukunda Mani. Design, Synthesis and Optoelectronic Properties of Monovalent Coinage Metal-Based Functional Materials toward Potential Lighting, Display and Energy-Harvesting Devices.
► Groundbreaking progress in molecule-based optoelectronic devices for lighting, display and energy-harvesting technologies demands highly efficient and easily processable functional materials with tunable properties governed by… (more)
▼ Groundbreaking progress in molecule-based optoelectronic devices for lighting, display and energy-harvesting technologies demands highly efficient and easily processable functional materials with tunable properties governed by their molecular/supramolecular structure variations. To date, functional coordination compounds whose function is governed by non-covalent weak forces (e.g., metallophilic, dπ-acid/dπ-base stacking, halogen/halogen and/or d/π interactions) remain limited. This is unlike the situation for metal-free organic semiconductors, as most metal complexes incorporated in optoelectronic devices have their function determined by the properties of the monomeric molecular unit (e.g., Ir(III)-phenylpyridine complexes in organic light-emitting diodes (OLEDs) and Ru(II)-polypyridyl complexes in dye-sensitized solar cells (DSSCs)). This dissertation represents comprehensive results of both experimental and theoretical studies, descriptions of synthetic methods and possible application allied to monovalent coinage metal-based functional materials. The main emphasis is given to the design and synthesis of functional materials with preset material properties such as light-emitting materials, light-harvesting materials and conducting materials. In terms of advances in fundamental scientific phenomena, the major highlight of the work in this dissertation is the discovery of closed-shell polar-covalent metal-metal bonds manifested by ligand-unassisted d10-d10 covalent bonds between Cu(I) and Au(I) coinage metals in the ground electronic state (~2.87 Å; ~45 kcal/mol). Moreover, this dissertation also reports pairwise intermolecular aurophilic interactions of 3.066 Å for an Au(I) complex, representing the shortest ever reported pairwise intermolecular aurophilic distances among all coinage metal(I) cyclic trimetallic complexes to date; crystals of this complex also exhibit gigantic luminescence thermochromism of 10,200 cm-1 (violet to red). From applications prospective, the work herein presents monovalent coinage metal-based functional optoelectronic materials such as heterobimetallic complexes with near-unity photoluminescence quantum yield, metallic or semiconducting integrated donor-acceptor stacks and a new class of Au(III)-based black absorbers with cooperative intermolecular iodophilic (I…I) interactions that sensitize the harvesting of all UV, all visible, and a broad spectrum of near-IR regions of the solar spectrum. These novel functional materials of cyclic trimetallic coinage metal complexes have been characterized by a broad suit of spectroscopic and structural analysis methods in the solid state and solution. Advisors/Committee Members: Omary, Mohammad A, D'Souza, Francis, Slaughter, LeGrande M, Richmond, Michael, Balch, Alan L.
Subjects/Keywords: Functional materials; Supramolecular interactions
Ghimire, M. M. (2017). Design, Synthesis and Optoelectronic Properties of Monovalent Coinage Metal-Based Functional Materials toward Potential Lighting, Display and Energy-Harvesting Devices . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1011848/
Ghimire, Mukunda Mani. "Design, Synthesis and Optoelectronic Properties of Monovalent Coinage Metal-Based Functional Materials toward Potential Lighting, Display and Energy-Harvesting Devices." 2017. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc1011848/.
Ghimire, Mukunda Mani. "Design, Synthesis and Optoelectronic Properties of Monovalent Coinage Metal-Based Functional Materials toward Potential Lighting, Display and Energy-Harvesting Devices." 2017. Web. 21 Jan 2020.
Ghimire MM. Design, Synthesis and Optoelectronic Properties of Monovalent Coinage Metal-Based Functional Materials toward Potential Lighting, Display and Energy-Harvesting Devices. [Internet] [Thesis]. University of North Texas; 2017. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1011848/.
Ghimire MM. Design, Synthesis and Optoelectronic Properties of Monovalent Coinage Metal-Based Functional Materials toward Potential Lighting, Display and Energy-Harvesting Devices. [Thesis]. University of North Texas; 2017. Available from: https://digital.library.unt.edu/ark:/67531/metadc1011848/
18. Zhou, Ting. Electrodeposition of Molybdenum-Based Coatings from Aqueous Alkaline Solutions for Enhanced Corrosion Resistance.
► Zn-Mo coatings are very promising environment friendly anticorrosive coatings as replacement materials for cadmium and chromium (VI) based conversion layers. Electrodeposition has become a favorable… (more)
▼ Zn-Mo coatings are very promising environment friendly anticorrosive coatings as replacement materials for cadmium and chromium (VI) based conversion layers. Electrodeposition has become a favorable technique in fabricating coatings due to its low cost, ease of use, and overall experimental control of coating quality. Very little research so far has been done for the electrodeposition of Zn-Mo coatings under alkaline conditions. In this work, Zn and Zn-Mo coatings were electrochemically deposited on stainless steel from an aqueous alkaline citrate solution. An organic compound, vanillin, was added to the electrolyte as a leveling agent for improving interlayer adherence and corrosion resistance of Zn-Mo coatings. Ni-Mo alloys have been known to possess high tensile strength and excellent corrosion protection of steels, and MoTe2 layers have a potential for the application in anticorrosive coatings due to their hydrophobic properties. In this study, MoTe2-Ni-Mo coatings were deposited on stainless steel using both sputtering and electrodeposition methods. These coatings with high corrosion resistance and other desirable properties are in demand in the oil and gas industry since they can protect and thus extend the lifetime of the underlying materials when exposed to aggressive environments. The Zn-Mo and MoTe2-Ni-Mo coatings were evaluated for chemical composition and corrosion behavior using different types of instrumental and electrochemical techniques. The addition of vanillin to the electrolyte did not change the crystalline structure or composition of the Zn-Mo coating, however, the corrosion resistance of the coating was significantly improved by the leveling effect of vanillin during the electrodeposition. The corrosion resistance of the Ni-Mo coating was also enhanced by applying the hydrophobic MoTe2 monolayer on the top surface. Advisors/Committee Members: Golden, Teresa D., Marshall, Paul, Acree, William E. (William Eugene), Omary, Mohammad.
Subjects/Keywords: Electrodeposition; Mo-based coatings; alkaline solutions; corrosion resistance.; Chemistry, Analytical
Zhou, T. (2018). Electrodeposition of Molybdenum-Based Coatings from Aqueous Alkaline Solutions for Enhanced Corrosion Resistance . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1157641/
Zhou, Ting. "Electrodeposition of Molybdenum-Based Coatings from Aqueous Alkaline Solutions for Enhanced Corrosion Resistance." 2018. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc1157641/.
Zhou, Ting. "Electrodeposition of Molybdenum-Based Coatings from Aqueous Alkaline Solutions for Enhanced Corrosion Resistance." 2018. Web. 21 Jan 2020.
Zhou T. Electrodeposition of Molybdenum-Based Coatings from Aqueous Alkaline Solutions for Enhanced Corrosion Resistance. [Internet] [Thesis]. University of North Texas; 2018. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1157641/.
Zhou T. Electrodeposition of Molybdenum-Based Coatings from Aqueous Alkaline Solutions for Enhanced Corrosion Resistance. [Thesis]. University of North Texas; 2018. Available from: https://digital.library.unt.edu/ark:/67531/metadc1157641/
19. Kaipa, Ushasree. Synthesis and Characterization of Two and Three Coordinate Gold (I) Conjugated and Rigid Metallodendrimers.
► This dissertation is a study of two major topics that involve synthetic strategies for new classes of phosphorescent gold(I)-based metallodendrimers. The phosphorescence of organic and… (more)
▼ This dissertation is a study of two major topics that involve synthetic strategies for new classes of phosphorescent gold(I)-based metallodendrimers. The phosphorescence of organic and inorganic luminophores originates from spin-orbit coupling owing to internal or external heavy atom effects as well as metal-centered emissions. Previous work in the Omary group entailed systematically designed small molecules, metallopolymers, and unconjugated metallodendrimers that contain d10 and d8 metals, whereas this dissertation aims in part to expand such strategies to the conjugated metallodendrimer regime. In one approach novel synthetic strategies were used to make first-generation phenyl acetylene dendrimers and phosphine derivatives thereof. The phosphine dendrimers are made by tethering one of the phosphines to an unsaturated dendrimer, as such phosphine dendrimers are better chromophores and luminophores due to their structural rigidity and extended conjugation. In another approach, 2- and 3-coordinate Au(I) dendritic complexes are synthesized from these phosphine dendrimers. This study is further extended to study metallodendritic complexes with different cores, for example triphenylene-based metallodendritic complexes with six acetylene branches. The physical properties of the metallodendrimers can be modulated upon proceeding to further dendrimer generations or by using solubilizing groups on the peripheral phosphines, thus allowing better processability for thin-film fabrication as required for molecular electronic devices and higher chance for crystal growth toward accurate structural characterization. Other data produced in this project suggested that some structural alterations led to porous solids that render them suitable for realized and potential applications in energy storage and carbon capture. The interesting luminescence properties of the metallodendrimers and porous extended solids produced in this dissertation are significant toward utilizing such materials for optoelectronic applications such as energy-saving organic light-emitting diodes and optical sensors for environmental pollutants. Advisors/Committee Members: Omary, Mohammad A., Richmond, Michael G., Cundari, Thomas R., Petros, Robby A..
Subjects/Keywords: Metallodendrimers; conjugated and photoluminescence
Kaipa, U. (2012). Synthesis and Characterization of Two and Three Coordinate Gold (I) Conjugated and Rigid Metallodendrimers . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc149678/
Kaipa, Ushasree. "Synthesis and Characterization of Two and Three Coordinate Gold (I) Conjugated and Rigid Metallodendrimers." 2012. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc149678/.
Kaipa, Ushasree. "Synthesis and Characterization of Two and Three Coordinate Gold (I) Conjugated and Rigid Metallodendrimers." 2012. Web. 21 Jan 2020.
Kaipa U. Synthesis and Characterization of Two and Three Coordinate Gold (I) Conjugated and Rigid Metallodendrimers. [Internet] [Thesis]. University of North Texas; 2012. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc149678/.
Kaipa U. Synthesis and Characterization of Two and Three Coordinate Gold (I) Conjugated and Rigid Metallodendrimers. [Thesis]. University of North Texas; 2012. Available from: https://digital.library.unt.edu/ark:/67531/metadc149678/
20. Determan, John J. Photophysics and Photochemistry of Copper(I) Phosphine and Collidine Complexes: An Experimental/Theoretical Investigation.
► Copper(I) complexes have been studied through both experimental and computational means in the presented work. Overall, the work focuses on photophysical and photochemical properties of… (more)
▼ Copper(I) complexes have been studied through both experimental and computational means in the presented work. Overall, the work focuses on photophysical and photochemical properties of copper(I) complexes. Photophysical and photochemical properties are found to be dependent on the geometries of the copper(I) complexes. One of the geometric properties that are important for both photochemical and photophysical properties is coordination number. Coordination numbers have been observed to be dependent on both ligand size and recrystallization conditions. The complexes geometric structure, as well as the electronic effects of the coordination ligands, is shown both computationally as well as experimentally to affect the emission energies. Two-coordinate complexes are seen to have only weak emission at liquid nitrogen temperature (77 K), while at room temperature (298 K) the two-coordinate complexes are not observed to be luminescent. Three-coordinate complexes are observed to be luminescent at liquid nitrogen temperature as well as at room temperature. The three-coordinate complexes have a Y-shaped ground (S0) state that distorts towards a T-shape upon photoexcitation to the lowest lying phosphorescent state (T1). The geometric distortion is tunable by size of the coordinating ligand. Luminescence is controllable by limiting the amount of non-radiative emission. One manner by which non-radiative emission is controlled is the amount of geometric distortion that occurs as the complex undergoes photoexcitation. Bulky ligands allow for less distortion than smaller ligands, leading to higher emission energies (blue shifted energies) with higher quantum efficiency. Tuning emission and increasing quantum efficiencies can be used to create highly efficient, white emitting materials for use in white OLEDS. Advisors/Committee Members: Omary, Mohammad A., Cundari, Thomas R., Richmond, Michael G., Wilson, Angela K..
Subjects/Keywords: Copper(I) complexes; OLED; luminescence; photochemistry; photophysics
Determan, J. J. (2011). Photophysics and Photochemistry of Copper(I) Phosphine and Collidine Complexes: An Experimental/Theoretical Investigation . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc84199/
Determan, John J. "Photophysics and Photochemistry of Copper(I) Phosphine and Collidine Complexes: An Experimental/Theoretical Investigation." 2011. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc84199/.
Determan, John J. "Photophysics and Photochemistry of Copper(I) Phosphine and Collidine Complexes: An Experimental/Theoretical Investigation." 2011. Web. 21 Jan 2020.
Determan JJ. Photophysics and Photochemistry of Copper(I) Phosphine and Collidine Complexes: An Experimental/Theoretical Investigation. [Internet] [Thesis]. University of North Texas; 2011. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc84199/.
Determan JJ. Photophysics and Photochemistry of Copper(I) Phosphine and Collidine Complexes: An Experimental/Theoretical Investigation. [Thesis]. University of North Texas; 2011. Available from: https://digital.library.unt.edu/ark:/67531/metadc84199/
21. Marpu, Sreekar B. Biocompatible Hybrid Nanomaterials Involving Polymers and Hydrogels Interfaced with Phosphorescent Complexes and Toxin-Free Metallic Nanoparticles for Biomedical Applications.
► The major topics discussed are all relevant to interfacing brightly phosphorescent and non-luminescent coinage metal complexes of [Ag(I) and Au(I)] with biopolymers and thermoresponsive gels… (more)
▼ The major topics discussed are all relevant to interfacing brightly phosphorescent and non-luminescent coinage metal complexes of [Ag(I) and Au(I)] with biopolymers and thermoresponsive gels for making hybrid nanomaterials with an explanation on syntheses, characterization and their significance in biomedical fields. Experimental results and ongoing work on determining outreaching consequences of these hybrid nanomaterials for various biomedical applications like cancer therapy, bio-imaging and antibacterial abilities are described. In vitro and in vivo studies have been performed on majority of the discussed hybrid nanomaterials and determined that the cytotoxicity or antibacterial activity are comparatively superior when compared to analogues in literature. Consequential differences are noticed in photoluminescence enhancement from hybrid phosphorescent hydrogels, phosphorescent complex ability to physically crosslink, Au(I) sulfides tendency to form NIR (near-infrared) absorbing AuNPs compared to any similar work in literature. Syntheses of these hybrid nanomaterials has been thoroughly investigated and it is determined that either metallic nanoparticles syntheses or syntheses of phosphorescent hydrogels can be carried in single step without involving any hazardous reducing agents or crosslinkers or stabilizers that are commonly employed during multiple step syntheses protocols for syntheses of similar materials in literature. These astounding results that have been discovered within studies of hybrid nanomaterials are an asset to applications ranging from materials development to health science and will have striking effect on environmental and green chemistry approaches. Advisors/Committee Members: Hu, Zhibing, Omary, Mohammad A., Reidy, Rick, D'Souza, Nandika, El Bounani, Mohammad.
Subjects/Keywords: hydrogels; luminescence; nanoparticles
Marpu, S. B. (2011). Biocompatible Hybrid Nanomaterials Involving Polymers and Hydrogels Interfaced with Phosphorescent Complexes and Toxin-Free Metallic Nanoparticles for Biomedical Applications . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc84243/
Marpu, Sreekar B. "Biocompatible Hybrid Nanomaterials Involving Polymers and Hydrogels Interfaced with Phosphorescent Complexes and Toxin-Free Metallic Nanoparticles for Biomedical Applications." 2011. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc84243/.
Marpu, Sreekar B. "Biocompatible Hybrid Nanomaterials Involving Polymers and Hydrogels Interfaced with Phosphorescent Complexes and Toxin-Free Metallic Nanoparticles for Biomedical Applications." 2011. Web. 21 Jan 2020.
Marpu SB. Biocompatible Hybrid Nanomaterials Involving Polymers and Hydrogels Interfaced with Phosphorescent Complexes and Toxin-Free Metallic Nanoparticles for Biomedical Applications. [Internet] [Thesis]. University of North Texas; 2011. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc84243/.
Marpu SB. Biocompatible Hybrid Nanomaterials Involving Polymers and Hydrogels Interfaced with Phosphorescent Complexes and Toxin-Free Metallic Nanoparticles for Biomedical Applications. [Thesis]. University of North Texas; 2011. Available from: https://digital.library.unt.edu/ark:/67531/metadc84243/
22. Tekarli, Sammer M. Computational Investigation of Molecular Optoelectronic and Biological Systems.
► The scope of work in this dissertation has comprised several major investigations on applications and theoretical studies of ab initio quantum mechanics and density functional… (more)
▼ The scope of work in this dissertation has comprised several major investigations on applications and theoretical studies of ab initio quantum mechanics and density functional theory where those techniques were applied to the following: (i) investigation of the performance of density functionals for the computations of molecular properties of 3d transition metal containing systems; (ii) guidance for experimental groups for rational design of macrometallocyclic multinuclear complexes with superior π-acidity and π-basicity that are most suitable for p- and n-type semiconductors of metal-organic molecules and nanomaterials; (iii) investigation of the metallo-aromaticity of multi-nuclear metal complexes; (iv) investigation of the kinetics and thermodynamics of copper-mediated nitrene insertion into C-H and H-H bond; and (v) accurate computations of dissociation energies of hydrogen-bonded DNA duplex moieties utilizing the resolution of identity correlation consistent composite approach (RI-ccCA). Advisors/Committee Members: Cundari, Thomas R., Van Stipdonk, Michael J., Schwartz, Martin, Wilson, Angela K., Omary, Mohammad A..
Subjects/Keywords: computational; optoelctronic; ccCA,; quantum mechanics; consistent composite approach
Tekarli, S. M. (2011). Computational Investigation of Molecular Optoelectronic and Biological Systems . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc84288/
Tekarli, Sammer M. "Computational Investigation of Molecular Optoelectronic and Biological Systems." 2011. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc84288/.
Tekarli, Sammer M. "Computational Investigation of Molecular Optoelectronic and Biological Systems." 2011. Web. 21 Jan 2020.
Tekarli SM. Computational Investigation of Molecular Optoelectronic and Biological Systems. [Internet] [Thesis]. University of North Texas; 2011. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc84288/.
Tekarli SM. Computational Investigation of Molecular Optoelectronic and Biological Systems. [Thesis]. University of North Texas; 2011. Available from: https://digital.library.unt.edu/ark:/67531/metadc84288/
23. Ross, Nick Mark. Interfacial Electrochemistry of Cu/Al Alloys for IC Packaging and Chemical Bonding Characterization of Boron Doped Hydrogenated Amorphous Silicon Films for Infrared Cameras.
► We focused on a non-cooling room temperature microbolometer infrared imaging array device which includes a sensing layer of p-type a-Si:H component layers doped with boron.… (more)
▼ We focused on a non-cooling room temperature microbolometer infrared imaging array device which includes a sensing layer of p-type a-Si:H component layers doped with boron. Boron incorporation and bonding configuration were investigated for a-Si:H films grown by plasma enhanced chemical deposition (PECVD) at varying substrate temperatures, hydrogen dilution of the silane precursor, and dopant to silane ratio using multiple internal reflection infrared spectroscopy (MIR-IR). This study was then confirmed from collaborators via Raman spectroscopy. MIR-IR analyses reveal an interesting counter-balance relationship between boron-doping and hydrogen-dilution growth parameters in PECVD-grown a-Si:H. Specifically, an increase in the hydrogen dilution ratio (H2/SiH4) or substrate temperature was found to increase organization of the silicon lattice in the amorphous films. It resulted in the decrease of the most stable SiH bonding configuration and thus decrease the organization of the film. The new chemical bonding information of a-Si:H thin film was correlated with the various boron doping mechanisms proposed by theoretical calculations. The study revealed the corrosion morphology progression on aluminum alloy (Al, 0.5% Cu) under acidic chloride solution. This is due to defects and a higher copper content at the grain boundary. Direct galvanic current measurement, linear sweep voltammetry (LSV), and Tafel plots are used to measure corrosion current and potential. Hydrogen gas evolution was also observed (for the first time) in Cu/Al bimetallic interface in areas of active corrosion. Mechanistic insight that leads to effective prevention of aluminum bond pad corrosion is explored and discussed. (Chapter 4) Aluminum bond pad corrosion activity and mechanistic insight at a Cu/Al bimetallic interface typically used in microelectronic packages for automotive applications were investigated by means of optical and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and electrochemistry. Screening of corrosion variables (temperature, moisture, chloride ion concentration, pH) have been investigated to find their effect on corrosion rate and to better understand the Al/Cu bimetallic corrosion mechanism. The study revealed the corrosion morphology progression on aluminum alloy (Al, 0.5% Cu) under acidic chloride solution. The corrosion starts as surface roughening which evolves into a dendrite structure and later continues to grow into a mud-crack type corrosion. SEM showed the early stage of corrosion with dendritic formation usually occurs at the grain boundary. This is due to defects and a higher copper content at the grain boundary. The impact of copper bimetallic contact on aluminum corrosion was explored by sputtering copper microdots on aluminum substrate. Copper micropattern screening revealed that the corrosion is activated on the Al/Cu interface area and driven by the large potential difference; it was also seen to proceed at much higher rates than those observed with bare aluminum. Direct… Advisors/Committee Members: Chyan, Oliver M, Golden, Teresa D, Acree, William E. (William Eugene), Omary, Mohammad.
Subjects/Keywords: Electrochemistry; Cu Al Bimetallic Corrosion; Integrated Circuit (IC) Packaging; Boron Doped Hydrogenated Amorphous Silicon; Cu wire bonded Devices on Al pads; acidic chloride corrosion prevention; FTIR; MIR-IR; ATR; Chemistry, Analytical; Engineering, Packaging; Engineering, Electronics and Electrical
Ross, N. M. (2016). Interfacial Electrochemistry of Cu/Al Alloys for IC Packaging and Chemical Bonding Characterization of Boron Doped Hydrogenated Amorphous Silicon Films for Infrared Cameras . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc849696/
Ross, Nick Mark. "Interfacial Electrochemistry of Cu/Al Alloys for IC Packaging and Chemical Bonding Characterization of Boron Doped Hydrogenated Amorphous Silicon Films for Infrared Cameras." 2016. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc849696/.
Ross, Nick Mark. "Interfacial Electrochemistry of Cu/Al Alloys for IC Packaging and Chemical Bonding Characterization of Boron Doped Hydrogenated Amorphous Silicon Films for Infrared Cameras." 2016. Web. 21 Jan 2020.
Ross NM. Interfacial Electrochemistry of Cu/Al Alloys for IC Packaging and Chemical Bonding Characterization of Boron Doped Hydrogenated Amorphous Silicon Films for Infrared Cameras. [Internet] [Thesis]. University of North Texas; 2016. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc849696/.
Ross NM. Interfacial Electrochemistry of Cu/Al Alloys for IC Packaging and Chemical Bonding Characterization of Boron Doped Hydrogenated Amorphous Silicon Films for Infrared Cameras. [Thesis]. University of North Texas; 2016. Available from: https://digital.library.unt.edu/ark:/67531/metadc849696/
24. Elmarhoumi, Nader M. Novel Semi-Conductor Material Systems: Molecular Beam Epitaxial Growth and Characterization.
► Semi-conductor industry relies heavily on silicon (Si). However, Si is not a direct-band gap semi-conductor. Consequently, Si does not possess great versatility for multi-functional applications… (more)
▼ Semi-conductor industry relies heavily on silicon (Si). However, Si is not a direct-band gap semi-conductor. Consequently, Si does not possess great versatility for multi-functional applications in comparison with the direct band-gap III-V semi-conductors such as GaAs. To bridge this gap, what is ideally required is a semi-conductor material system that is based on silicon, but has significantly greater versatility. While sparsely studied, the semi-conducting silicides material systems offer great potential. Thus, I focused on the growth and structural characterization of ruthenium silicide and osmium silicide material systems. I also characterized iron silicon germanide films using extended x-ray absorption fine structure (EXAFS) to reveal phase, semi-conducting behavior, and to calculate nearest neighbor distances. The choice of these silicides material systems was due to their theoretically predicted and/or experimentally reported direct band gaps. However, the challenge was the existence of more than one stable phase/stoichiometric ratio of these materials. In order to possess the greatest control over the growth process, molecular beam epitaxy (MBE) has been employed. Structural and film quality comparisons of as-grown versus annealed films of ruthenium silicide are presented. Structural characterization and film quality of MBE grown ruthenium silicide and osmium silicide films via in situ and ex situ techniques have been done using reflection high energy electron diffraction, scanning tunneling microscopy, atomic force microscopy, cross-sectional scanning electron microscopy, x-ray photoelectron spectroscopy, and micro Raman spectroscopy. This is the first attempt, to the best of our knowledge, to grow osmium silicide thin films on Si(100) via the template method and compare it with the regular MBE growth method. The pros and cons of using the MBE template method for osmium silicide growth are discussed, as well as the structural differences of the as-grown versus annealed films. Future perspectives include further studies on other semi-conducting silicides material systems in terms of growth optimization and characterization. Advisors/Committee Members: Golding, Terry D., Perez, Jose M., Omary, Mohammad A., Rostovtsev, Yuri V..
Subjects/Keywords: Semi-conductor; silicides; molecular beam epitaxy
Elmarhoumi, N. M. (2013). Novel Semi-Conductor Material Systems: Molecular Beam Epitaxial Growth and Characterization . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc490047/
Elmarhoumi, Nader M. "Novel Semi-Conductor Material Systems: Molecular Beam Epitaxial Growth and Characterization." 2013. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc490047/.
Elmarhoumi, Nader M. "Novel Semi-Conductor Material Systems: Molecular Beam Epitaxial Growth and Characterization." 2013. Web. 21 Jan 2020.
Elmarhoumi NM. Novel Semi-Conductor Material Systems: Molecular Beam Epitaxial Growth and Characterization. [Internet] [Thesis]. University of North Texas; 2013. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc490047/.
Elmarhoumi NM. Novel Semi-Conductor Material Systems: Molecular Beam Epitaxial Growth and Characterization. [Thesis]. University of North Texas; 2013. Available from: https://digital.library.unt.edu/ark:/67531/metadc490047/
25. Prince, Bruce M. The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation.
► Our country continues to demand clean renewable energy to meet the growing energy needs of our time. Thus, natural gas, which is 87% by volume… (more)
▼ Our country continues to demand clean renewable energy to meet the growing energy needs of our time. Thus, natural gas, which is 87% by volume of methane, has become a hot topic of discussion because it is a clean burning fuel. However, the transportation of methane is not easy because it is a gas at standard temperature and pressure. The usage of transition metals for the conversion of small organic species like methane into a liquid has been a longstanding practice in stoichiometric chemistry. Nonetheless, the current two-step process takes place at a high temperature and pressure for the conversion of methane and steam to methanol via CO + H2 (syngas). The direct oxidation of methane (CH4) into methanol (CH3OH) via homogeneous catalysis is of interest if the system can operate at standard pressure and a temperature less than 250 C. Methane is an inert gas due to the high C-H bond dissociation energy (BDE) of 105 kcal/mol. This dissertation discusses a series of computational investigations of oxy-insertion pathways to understand the essential chemistry behind the functionalization of methane via the use of homogeneous transition metal catalysis. The methane to methanol (MTM) catalytic cycle is made up of two key steps: (1) C-H activation by a metal-methoxy complex, (2) the insertion of oxygen into the metal−methyl bond (oxy-insertion). While, the first step (C-H activation) has been well studied, the second step has been less studied. Thus, this dissertation focuses on oxy-insertion via a two-step mechanism, oxygen-atom transfer (OAT) and methyl migration, utilizing transition metal complexes known to activate small organic species (e.g., PtII and PdII complexes). This research seeks to guide experimental investigations, and probe the role that metal charge and coordination number play. Advisors/Committee Members: Cundari, Thomas R., 1964-, Omary, Mohammad A., 1969-, Schwartz, Martin, Richmond, Michael G..
Subjects/Keywords: DFT; oxy-insertion; methylmigration; methane to methanol; Methane.; Methanol.; Transition metal complexes.
Prince, B. M. (2014). The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc500116/
Prince, Bruce M. "The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation." 2014. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc500116/.
Prince, Bruce M. "The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation." 2014. Web. 21 Jan 2020.
Prince BM. The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation. [Internet] [Thesis]. University of North Texas; 2014. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc500116/.
Prince BM. The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation. [Thesis]. University of North Texas; 2014. Available from: https://digital.library.unt.edu/ark:/67531/metadc500116/
26. Arvapally, Ravi K. Sensitization of Lanthanides and Organic-Based Phosphorescence via Energy Transfer and Heavy-Atom Effects.
► The major topics discussed are the phosphorescence sensitization in the lanthanides via energy transfer and in the organics by heavy atom effects. The f-f transitions… (more)
▼ The major topics discussed are the phosphorescence sensitization in the lanthanides via energy transfer and in the organics by heavy atom effects. The f-f transitions in lanthanides are parity forbidden and have weak molar extinction coefficients. Upon complexation with the ligand, ttrpy (4'-p-Tolyl-[2,2':6',2"]-terpyridine) the absorption takes place through the ligand and the excitation is transferred to the lanthanides, which in turn emit. This process is known as "sensitized luminescence." Bright red emission from europium and bright green emission from terbium complexes were observed. There is ongoing work on the making of OLEDs with neutral complexes of lanthanide hexafluoroacetyl acetonate/ttrpy, studied in this dissertation. Attempts to observe analogous energy transfer from the inorganic donor complexes of Au(I) thiocyanates were unsuccessful due to poor overlap of the emissions of these systems with the absorptions of Eu(III) and Tb(III). Photophysics of silver-aromatic complexes deals with the enhancement of phosphorescence in the aromatics. The heavy atom effect of the silver is responsible for this enhancement in phosphorescence. Aromatics such as naphthalene, perylene, anthracene and pyrene were involved in this study. Stern Volmer plots were studied by performing the quenching studies. The quenchers employed were both heavy metals such as silver and thallium and lighter metal like potassium. Dynamic quenching as the predominant phenomenon was noticed. Advisors/Committee Members: Omary, Mohammad A., Cundari, Thomas R., Golden, Teresa D., Wilson, Angela K..
Subjects/Keywords: Lanthanides; Phosphorescence.; sensitization; aromatics; Rare earth metals.; Energy transfer.; Luminescence.; Aromatic compounds.
Arvapally, R. K. (2010). Sensitization of Lanthanides and Organic-Based Phosphorescence via Energy Transfer and Heavy-Atom Effects . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc28388/
Arvapally, Ravi K. "Sensitization of Lanthanides and Organic-Based Phosphorescence via Energy Transfer and Heavy-Atom Effects." 2010. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc28388/.
Arvapally, Ravi K. "Sensitization of Lanthanides and Organic-Based Phosphorescence via Energy Transfer and Heavy-Atom Effects." 2010. Web. 21 Jan 2020.
Arvapally RK. Sensitization of Lanthanides and Organic-Based Phosphorescence via Energy Transfer and Heavy-Atom Effects. [Internet] [Thesis]. University of North Texas; 2010. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc28388/.
Arvapally RK. Sensitization of Lanthanides and Organic-Based Phosphorescence via Energy Transfer and Heavy-Atom Effects. [Thesis]. University of North Texas; 2010. Available from: https://digital.library.unt.edu/ark:/67531/metadc28388/
27. Chen, Wei-Hsuan. Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices.
► This research focused on the development of new metal triimine complexes of Pt(II), Pd(II), and Ni(II) for use in three types of molecular electronic devices:… (more)
▼ This research focused on the development of new metal triimine complexes of Pt(II), Pd(II), and Ni(II) for use in three types of molecular electronic devices: dye sensitized solar cells (DSSCs), organic light-emitting diodes (OLEDs), and organic field effect transistors (OFETs). Inorganic complexes combine many advantages of their chemical and photophysical properties and are processable on inexpensive and large area substrates for various optoelectronic applications. For DSSCs, a series of platinum (II) triimine complexes were synthesized and evaluated as dyes for nanocrystalline oxide semiconductors. Pt (II) forms four coordinate square planar complexes with various co-ligands and counterions and leads to spanning absorption across a wide range in the UV-Vis-NIR regions. When those compounds were applied to the oxide semiconductors, they led to photocurrent generation thus verifying the concept of their utility in solar cells. In the OLEDs project, a novel pyridyl-triazolate Pt(II) complex, Pt(ptp)2 was synthesized and generated breakthrough OLEDs. In the solution state, the electronic absorption and emission of the square planar structure results in metal-to-ligand charge transfer (MLCT) and an aggregation band. Tunable photoluminescence and electroluminescence colors from blue to red wavelengths have been attained upon using Pt(ptp)2 under different experimental conditions and OLED architectures. In taking advantage of these binary characteristics for both monomer and excimer emissions, cool and warm white OLEDs suitable for solid-state lighting have been fabricated. The OFETs project represented an extension of the study of pyridyl-triazolate d8 metal complexes due to their electron-transporting behavior and n-type properties. A prescreening step by using thermogravimetric calorimetry has demonstrated the stability of all three M(ptp)2 and M(ptp)2(py)2 compounds and their amenability to sublimation. Preliminary current-voltage measurements from simple diodes has achieved unidirectional current from a Pt(ptp)2 neat layer and demonstrated its n-type semiconducting behavior. Advisors/Committee Members: Omary, Mohammad A., Chyan, Oliver, Cundari, Thomas R., Du, Jincheng, Richmond, Michael G., Gnade, Bruce E..
Subjects/Keywords: Platinum complexes; divalent group 10 metals; electronic devices; Metal complexes.; Molecular electronics.; Dye-sensitized solar cells.; Light emitting diodes.; Organic field-effect transistors.
Chen, W. (2010). Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc30443/
Chen, Wei-Hsuan. "Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices." 2010. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc30443/.
Chen, Wei-Hsuan. "Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices." 2010. Web. 21 Jan 2020.
Chen W. Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices. [Internet] [Thesis]. University of North Texas; 2010. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc30443/.
Chen W. Triimine Complexes of Divalent Group 10 Metals for Use in Molecular Electronic Devices. [Thesis]. University of North Texas; 2010. Available from: https://digital.library.unt.edu/ark:/67531/metadc30443/
28. Li, Minghang. Device Engineering for Enhanced Efficiency from Platinum(II) Phosphorescent OLEDs.
► Phosphorescent organic light emitting diodes (PHOLEDs) based on efficient electrophosphorescent dopant, platinum(II)-pyridyltriazolate complex, bis[3,5-bis(2-pyridyl)-1,2,4-triazolato]platinum(II) (Pt(ptp)2) have been studied and improved with respect to power efficiency,… (more)
▼ Phosphorescent organic light emitting diodes (PHOLEDs) based on efficient electrophosphorescent dopant, platinum(II)-pyridyltriazolate complex, bis[3,5-bis(2-pyridyl)-1,2,4-triazolato]platinum(II) (Pt(ptp)2) have been studied and improved with respect to power efficiency, external efficiency, chromacity and efficiency roll-off. By studying the electrical and optical behavior of the doped devices and functionality of the various constituent layers, devices with a maximum EQE of 20.8±0.2 % and power efficiency of 45.1±0.9 lm/W (77lm/W with luminaries) have been engineered. This improvement compares to devices whose emission initially could only be detected by a photomultiplier tube in a darkened environment. These devices consisted of a 65 % bis[3,5-bis(2-pyridyl)-1,2,4-triazolato]platinum(II) (Pt(ptp)2) doped into 4,4'-bis(carbazol-9-yl)triphenylamine (CBP) an EML layer, a hole transporting layer/electron blocker of 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC), an electron transport layer of 1,3,5-tris(phenyl-2-benzimidazolyl)-benzene (TPBI), and a LiF/Al cathode. These devices show the acceptable range for warm white light quadrants and qualify to be called "warm white" even w/o adding another emissive layer. Dual EML devices composed of neat Pt(ptp)2 films emitting orange and CBP: Pt(ptp)2 film emitting blue-green produced a color rendering index (CRI) of 59 and color coordinates (CIE) of (0.47,0.49) at 1000Cd/m² with power efficiency of 12.6±0.2 lm/W and EQE of 10.8±0.2 %. Devices with two blue fluorescent emission layers as singlet filters and one broad yellow emission layer from CBP: Pt(ptp)2 displayed a CRI of 78 and CIE of (0.28,0.31) at 100Cd/m² with maximum power efficiency of 6.7±0.3 lm/W and EQE of 5.7±0.2 %. Advisors/Committee Members: Shepherd, Nigel, Omary, Mohammad, Reidy, Richard F., Du, Jincheng, Bouanani, Mohammed El.
Subjects/Keywords: Platinum(II); phosphorescent; OLEDs; Light emitting diodes.; Platinum.; Thin films.
Li, M. (2010). Device Engineering for Enhanced Efficiency from Platinum(II) Phosphorescent OLEDs . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc30482/
Li, Minghang. "Device Engineering for Enhanced Efficiency from Platinum(II) Phosphorescent OLEDs." 2010. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc30482/.
Li, Minghang. "Device Engineering for Enhanced Efficiency from Platinum(II) Phosphorescent OLEDs." 2010. Web. 21 Jan 2020.
Li M. Device Engineering for Enhanced Efficiency from Platinum(II) Phosphorescent OLEDs. [Internet] [Thesis]. University of North Texas; 2010. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc30482/.
Li M. Device Engineering for Enhanced Efficiency from Platinum(II) Phosphorescent OLEDs. [Thesis]. University of North Texas; 2010. Available from: https://digital.library.unt.edu/ark:/67531/metadc30482/
29. Wilks, Justin. Free Radical Chemistries at the Surface of Electronic Materials.
► The focus of the following research was to (1) understand the chemistry involved in nitriding an organosilicate glass substrate prior to tantalum deposition, as well… (more)
▼ The focus of the following research was to (1) understand the chemistry involved in nitriding an organosilicate glass substrate prior to tantalum deposition, as well as the effect nitrogen incorporation plays on subsequent tantalum deposition and (2) the reduction of a native oxide, the removal of surface contaminants, and the etching of a HgCdTe surface utilizing atomic hydrogen. These studies were investigated utilizing XPS, TEM and AFM. XPS data show that bombardment of an OSG substrate with NH3 and Ar ions results in the removal of carbon species and the incorporation of nitrogen into the surface. Tantalum deposition onto a nitrided OSG surface results in the initial formation of tantalum nitride with continued deposition resulting in the formation of tantalum. This process is a direct method for forming a thin TaN/Ta bilayer for use in micro- and nanoelectronic devices. Exposure to atomic hydrogen is shown to increase the surface roughness of both air exposed and etched samples. XPS results indicate that atomic hydrogen reduces tellurium oxide observed on air exposed samples via first-order kinetics. The removal of surface contaminants is an important step prior to continued device fabrication for optimum device performance. It is shown here that atomic hydrogen effectively removes adsorbed chlorine from the HgCdTe surface. Advisors/Committee Members: Kelber, Jeffry Alan, Golden, Teresa D., Omary, Mohammad A., Cooke, Stephen A..
Subjects/Keywords: X-ray photoelectron spectroscopy; surface science; HgCdTe; Free radicals (Chemistry); Surface chemistry.; Electronics – Materials – Surfaces.
Wilks, J. (2010). Free Radical Chemistries at the Surface of Electronic Materials . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc31552/
Wilks, Justin. "Free Radical Chemistries at the Surface of Electronic Materials." 2010. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc31552/.
Wilks, Justin. "Free Radical Chemistries at the Surface of Electronic Materials." 2010. Web. 21 Jan 2020.
Wilks J. Free Radical Chemistries at the Surface of Electronic Materials. [Internet] [Thesis]. University of North Texas; 2010. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc31552/.
Wilks J. Free Radical Chemistries at the Surface of Electronic Materials. [Thesis]. University of North Texas; 2010. Available from: https://digital.library.unt.edu/ark:/67531/metadc31552/
30. Huang, Shih-huang. Synthetic, Mechanistic, and Structural Studies of Polynuclear Metal Clusters and Hydrazido-Substituted Tantalum(V) Compounds.
► A combined experimental and computational study on the reversible ortho-metalation exhibited by the triosmium cluster Os3(CO)10(dppm) (dppm = 1,1-bis(diphenylphosphino)methane is reported. The conversion of nonacarbonyl… (more)
▼ A combined experimental and computational study on the reversible ortho-metalation exhibited by the triosmium cluster Os3(CO)10(dppm) (dppm = 1,1-bis(diphenylphosphino)methane is reported. The conversion of nonacarbonyl cluster HOs3(CO)9[-PhP(C6H4)CH2PPh2] to Os3(CO)10(dppm) is independent of added CO and exhibits a significant inverse equilibrium isotope effect (EIE). Reductive coupling of the C-H bond in HOs3(CO)9[-PhP(C6H4)CH2PPh2] leads to the formation of agostic C-H and two distinct aryl-π species prior to the rate-limiting formation of the unsaturated cluster Os3(CO)9(dppm). Heating the unsaturated dimer H2Re2(CO)8 with Cp*Rh(CO)2 (Cp* = 1,2,3,4,5-pentamethylcyclopentadiene) at elevated temperature affords the new trimetallic clusters H2RhRe2Cp*(CO)9 and HRh2ReCp*2(CO)6, and the spiked-triangular cluster HRhRe3Cp*(CO)14. H2Re2(CO)8 reacts with Cp*2Rh2(CO)2 under identical conditions to furnish H2RhRe2Cp*(CO)9 and HRh2ReCp*2(CO)6 as the principal products, in addition to the tetrahedral cluster H2Rh2Re2Cp*2(CO)8. H2RhRe2Cp*(CO)9 undergoes facile fragmentation in the presence of halogenated solvents and the thiols RSH (where R = H, C6H4Me-p) to afford the structurally characterized products Cp*Rh(-Cl)3Re(CO)3, S2Rh3Cp*(CO)4, Cp*Rh(-Cl)(-SC6H4Me-p)2Re(CO)3, and Cp*Rh(-SC6H4Me-p)3Re(CO)3. The new hydrazido-substituted compounds TaCl(NMe2)3[N(TMS)NMe2] (TMS = tetramethylsilyl) and Ta(NMe2)4[N(TMS)NMe2] have been synthesized and their structures established by X-ray crystallography. The latter product represents the first structurally characterized octahedral tantalum(V) complex containing a single hydrazido(I) ligand in an all-nitrogen coordinated environment about the metal center. The fluxional properties of the amido and hydrazido ligands in these new compounds have been established by VT 1H NMR spectroscopy (VT = variable temperature). Preliminary data using Ta(NMe2)4[N(TMS)NMe2] as an ALD (ALD = atomic layer deposition) precursor for the preparation of tantalum nitride and tantalum oxide thin films are presented. Advisors/Committee Members: Richmond, Michael G., Borden, Weston T., Omary, Mohammad A., Cooke, Stephen A..
Subjects/Keywords: Osmium cluster; tantalum compounds; polynuclear cluster; isotope effect; phosiphine ligand; Metal complexes.; Tantalum.
Huang, S. (2010). Synthetic, Mechanistic, and Structural Studies of Polynuclear Metal Clusters and Hydrazido-Substituted Tantalum(V) Compounds . (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc33166/
Huang, Shih-huang. "Synthetic, Mechanistic, and Structural Studies of Polynuclear Metal Clusters and Hydrazido-Substituted Tantalum(V) Compounds." 2010. Thesis, University of North Texas. Accessed January 21, 2020. https://digital.library.unt.edu/ark:/67531/metadc33166/.
Huang, Shih-huang. "Synthetic, Mechanistic, and Structural Studies of Polynuclear Metal Clusters and Hydrazido-Substituted Tantalum(V) Compounds." 2010. Web. 21 Jan 2020.
Huang S. Synthetic, Mechanistic, and Structural Studies of Polynuclear Metal Clusters and Hydrazido-Substituted Tantalum(V) Compounds. [Internet] [Thesis]. University of North Texas; 2010. [cited 2020 Jan 21]. Available from: https://digital.library.unt.edu/ark:/67531/metadc33166/.
Huang S. Synthetic, Mechanistic, and Structural Studies of Polynuclear Metal Clusters and Hydrazido-Substituted Tantalum(V) Compounds. [Thesis]. University of North Texas; 2010. Available from: https://digital.library.unt.edu/ark:/67531/metadc33166/