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 Department: Chemistry
 Degree Level: Master's
 Collection: UNT Theses and Dissertations
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
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 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
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
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
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
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
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 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
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