You limited your search to:

  Partner: UNT Libraries
 Department: Chemistry
 Collection: UNT Theses and Dissertations
Aluminum and Copper Chemical Vapor Deposition on Fluoropolymer Dielectrics and Subsequent Interfacial Interactions

Aluminum and Copper Chemical Vapor Deposition on Fluoropolymer Dielectrics and Subsequent Interfacial Interactions

Date: December 1997
Creator: Sutcliffe, Ronald David
Description: This study is an investigation of the chemical vapor deposition (CVD) of aluminum and copper on fluoropolymer surfaces and the subsequent interfacial interactions.
Contributing Partner: UNT Libraries
An Attempt to Produce a High Octane Gasoline from C4 Hydrocarbons

An Attempt to Produce a High Octane Gasoline from C4 Hydrocarbons

Date: June 1939
Creator: Scott, Howard Winfred
Description: This thesis presents the results of an experiment conducted to discover if selenic acid or monazite sand are possible catalysts that can be used for the alkylation of isobutane and isobutene.
Contributing Partner: UNT Libraries
A Chemical Analysis of Yellow Dent Corn

A Chemical Analysis of Yellow Dent Corn

Date: August 1939
Creator: Hamby, R. B.
Description: This study examines history, climate, and distribution in relation to the chemical content of yellow dent corn.
Contributing Partner: UNT Libraries
A Chemical Investigation of Lake Dallas to Determine the Factors Influencing Plankton Growth.

A Chemical Investigation of Lake Dallas to Determine the Factors Influencing Plankton Growth.

Date: August 1939
Creator: Welch, Herschel
Description: A study to determine the organic content of Lake Dallas, and study the influence on plankton growth.
Contributing Partner: UNT Libraries
Chlorosulfonic Acid Reactions with Saturated Hydrocarbons

Chlorosulfonic Acid Reactions with Saturated Hydrocarbons

Date: May 1939
Creator: Stubblefield, H. L.
Description: This thesis examines the reactions of hydrocarbons exposed to chlorosulfonic acid in order to establish the reaction rate and associated molecular structure of each compound.
Contributing Partner: UNT Libraries
A Comparative Quantitative Study of the Common Elements Found in the Hackenberry

A Comparative Quantitative Study of the Common Elements Found in the Hackenberry

Date: June 1939
Creator: Bailey, Duward W.
Description: This comparative study attempts to determine the importance of soil fertility in determining how much of an element a plant absorbs.
Contributing Partner: UNT Libraries
A Dark Adaptation Study of College Men and Women

A Dark Adaptation Study of College Men and Women

Date: August 1940
Creator: Henry, Archie
Description: This study is the result of tests conducted to determine the adaptability of the human eye to darkness.
Contributing Partner: UNT Libraries
The Determination of the Constants in the System of Methyl Alcohol, Formic Acid, Methyl Formate and Water

The Determination of the Constants in the System of Methyl Alcohol, Formic Acid, Methyl Formate and Water

Date: August 1939
Creator: Cox, Ross L.
Description: Problems presented in this paper concern the chemical equilibrium of methyl alcohol, formic acid, and methyl formate when combined.
Contributing Partner: UNT Libraries
Diffusion of Hydrocarbons Through Rubber Membranes

Diffusion of Hydrocarbons Through Rubber Membranes

Date: August 1939
Creator: Long, Loren M.
Description: This thesis explores the seperation of isomeric paraffins in organic chemistry and how the resulting mixture of hydrocarbons might be examined.
Contributing Partner: UNT Libraries
Electrodeposition of Cadmium

Electrodeposition of Cadmium

Date: August 1939
Creator: Bond, T. Jackson
Description: This thesis presents findings of experiments conducted to determine the most feasible method to electroplate metal.
Contributing Partner: UNT Libraries
The Electrodeposition of Zinc

The Electrodeposition of Zinc

Date: August 1939
Creator: Flanagin, Charles E.
Description: This thesis examines the use of zinc for electroplating and compares its use to other metals. Experiments conducted to gather data indicated circumstances which resulted in optimal results.
Contributing Partner: UNT Libraries
The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation

The Mechanisms of Methane C–H Activation and Oxy-insertion Via Small Transition Metal Complexes: a DFT Computational Investigation

Date: May 2014
Creator: Prince, Bruce M.
Description: 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 ...
Contributing Partner: UNT Libraries
A Mineral Analysis of the Water of Lake Wichita

A Mineral Analysis of the Water of Lake Wichita

Date: August 1940
Creator: Lisle, F. M.
Description: This thesis resulted from analysis of the water in Lake Wichita so that sources of water content could be determined.
Contributing Partner: UNT Libraries
The Multi-reference Correlation Consistent Composite Approach: A New Vista In Quantitative Prediction Of Thermochemical And Spectroscopic Properties

The Multi-reference Correlation Consistent Composite Approach: A New Vista In Quantitative Prediction Of Thermochemical And Spectroscopic Properties

Date: December 2011
Creator: Oyedepo, Gbenga A.
Description: The multi-reference correlation consistent composite approach (MR-ccCA) was designed to reproduce the accuracy of more computationally intensive ab initio quantum mechanical methods like MR-ACPF-DK/aug-cc-pCV?Z-DK, albeit at a significantly reduced cost. In this dissertation, the development and applications of the MR-ccCA method and a variant of its single reference equivalent (the relativistic pseudopotential ccCA method) are reported. MR-ccCA is shown to predict the energetic properties of reactive intermediates, excited states species and transition states to within chemical accuracy (i.e. ±1.0 kcal mol 1) of reliable experimental values. The accuracy and versatility of MR-ccCA are also demonstrated in the prediction of the thermochemical and spectroscopic properties (such as atomization energies, enthalpies of formation and adiabatic transition energies of spin-forbidden excited states) of a series of silicon-containing compounds. The thermodynamic and kinetic feasibilities of the oxidative addition of an archetypal arylglycerol ?-aryl ether (?-O-4 linkage) substructure of lignin to Ni, Cu, Pd and Pt transition metal atoms using the efficient relativistic pseudopotential correlation consistent composite approach within an ONIOM framework (rp-ccCA-ONIOM), a multi-level multi-layer QM/QM method formulated to enhance the quantitative predictions of the chemical properties of heavy element-containing systems larger than hitherto attainable, are also reported.
Contributing Partner: UNT Libraries
A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices

A New Chromophoric Organic Molecule Toward Improved Molecular Optoelectronic Devices

Access: Use of this item is restricted to the UNT Community.
Date: December 2012
Creator: Halbert, Jason Paul
Description: 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.
Contributing Partner: UNT Libraries
A Quantitative Chemical Analysis of the Hicoria Pecan Nut Kernel

A Quantitative Chemical Analysis of the Hicoria Pecan Nut Kernel

Date: August 1939
Creator: Hollingsworth, Asa Kenneth
Description: This thesis explores the Hicoria genus and focuses on the Stuart variety of pecan tree. Experimentation yielded the ash constituents, fats, fat constants, crude fiber, protein, and sugar in shelled pecan samples.
Contributing Partner: UNT Libraries
Synthesis and Characterization of Two and Three Coordinate Gold (I) Conjugated and Rigid Metallodendrimers

Synthesis and Characterization of Two and Three Coordinate Gold (I) Conjugated and Rigid Metallodendrimers

Date: August 2012
Creator: Kaipa, Ushasree
Description: 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 ...
Contributing Partner: UNT Libraries
Synthetic and Structural Chemistry of Ligand-substituted Triosmium Clusters and a Rhenium(i) Complex

Synthetic and Structural Chemistry of Ligand-substituted Triosmium Clusters and a Rhenium(i) Complex

Date: August 2013
Creator: Lin, Chen-Hao
Description: The reaction of 2-[(diphenylphosphino)methyl]-6-methylpyridine (PN) with Os3(CO)12-n(MeCN)n [where n = 0 (1), 1 (2), 2 (3)] has been investigated. Os3(CO)12 reacts with PN in the presence of Me3NO to afford the clusters Os3(CO)11(1-PN) (4) and 1,2-Os3(CO)10(1-PN)2 (5). X-ray diffraction analyses confirm the equatorial coordination of the phosphine(s) in 4 and 5, with the two phosphines in the latter cluster exhibiting a 1,2-trans orientation about the Os-Os vector that contains the two ligands. Treatment of the MeCN-substituted cluster Os3(CO)11(MeCN) and PN (1:1 ratio) in CH2Cl2 gives clusters 4 and 5, in addition to HOs3(η1-Cl)(CO)10(1-PN) (6) as a result of competitive activation of the reaction solvent. Cluster 6 contains 48e- and the diffraction structure reveals the presence of axial chloride and equatorial phosphine ligands which are located on adjacent osmium atoms. The bridging hydride ligand in 6 spans the Cl,P-substituted Os-Os vector. The reaction of Os3(CO)10(MeCN)2 with PN furnishes 5, 6, and 1,1-Os3(CO)10(2-PN) (7) in yields that are dependent on the reagent stoichiometry and reaction solvent. The solid-state structure of 7 confirms the chelation of the PN ligand to a single osmium atom via the pyridine and phosphine moieties at axial and equatorial sites, respectively. The bonding in 7 relative to other ...
Contributing Partner: UNT Libraries
Targeted and Metal-loaded Polymeric Nanoparticles As Potential Cancer Therapeutics

Targeted and Metal-loaded Polymeric Nanoparticles As Potential Cancer Therapeutics

Access: Use of this item is restricted to the UNT Community.
Date: May 2014
Creator: Harris, Alesha N.
Description: Polymeric nanoparticles were designed, synthesized, and loaded with metal ions to explore the therapeutic potential for transition metals other than platinum found in cisplatin. Nanoparticles were synthesized to show the potential for polymer based vectors. Metal 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. Targeting was attempted with the expectation of observed increased particle uptake by cancer cells with flow cytometry and fluorescence microscopy. Results demonstrated that a variety of metals could be loaded to the nano-sized carriers in an aqueous environment, and that the release was pH-dependent. Expected increased targeting was inconsistent. The toxicity of these particles was measured in cancer cells where significant toxicity was observed in vitro via dosing of high copper-loaded nanoparticles and slight toxicity was observed in ruthenium-loaded nanoparticles. No significant toxicity was observed in cells dosed with metal-free nanoparticles. Future research will focus on ruthenium loaded polymeric nanoparticles with different targeting ligands dosed to different cell lines for the aim of increased uptake and decreased cancer cell viability.
Contributing Partner: UNT Libraries