51 Matching Results

Search Results

Results: 1 - 24 next
open access

Discontinuous Thermal Expansions and Phase Transformations in Crystals at Higher Temperatures

Description: The purpose of this investigation is to make more detailed studies of transformations. Fourteen compounds have been examined by high temperature X-ray diffraction for this purpose. The investigations have been carried out in such a way as to reveal: 1. the existence of transformations, 2. the influence of polarizability on thermal expansion, 3. the anisotropy of expansion, and 4. the discontinuity of thermal expansion.
Date: 1967
Creator: Hsu, Yuan Tsun
Partner: UNT Libraries
open access

Magnetic Exchange in Oxovanadium(IV) Complexes with N-Salicylideneamino Acids

Description: Copper(II) and oxovanadium(IV) ions resemble one another magnetically in having one unpaired electron in their complexes irrespective of their geometrical structures and bond types involved. Copper(II) complexes with antiferromagnetic exchange are well known. On the contrary, antiferromagnetic exchange in oxovanadium(IV) complexes is rather new and not well established. Very few oxovanadium(IV) complexes have been reported to have this anomalous magnetic property. In the investigation of the ma… more
Date: January 1968
Creator: Hu, James Hung-Jen
Partner: UNT Libraries
open access

Bonding Studies on Organolithium Compounds

Description: This study is concerned with the nature of the relatively unusual bonding which occurs in organolithium compounds as a direct result of the oligomerization and possible explanations for that bonding.
Date: August 1968
Creator: Peyton, Gary
Partner: UNT Libraries
open access

Synthesis of Ether-free Organomagnesium Compounds

Description: At the time this work was begun, there was some confusion about the technique necessary for the successful synthesis of organomagnesium compounds in hydrocarbon solvents and without solvents. It was decided to repeat the work of Bryce-Smith and Zakharkin. Thus began the study of the synthesis of organomagnesium compounds without solvents; the study of the reaction products of these organomagnesium compounds in hydrocarbons plus 2-butanone compared to the reaction products of the corresponding … more
Date: August 1967
Creator: Hanicak, John E.
Partner: UNT Libraries
open access

Some Studies Involving Pyridine N-oxide Reductase

Description: The study herein described involved the detection of pyridine N-oxide reductase activity in cell-free extracts of E. coli 9723, the determination of co-factors necessary for the enzymatic process, a study of the optimum conditions for enzyme catalysis, and a general characterization of the enzyme.
Date: August 1968
Creator: Waters, Samuel Wayne
Partner: UNT Libraries
open access

Some Studies of Tryosinase Activity in Streptomyces Antibioticus

Description: The study reported herein concerns itself with the isolation of melaninless mutants of S. antibioticus, ATCC, 3723, and with the demonstration that at least one of the sites of mutation involves that of the enzyme, tyrosinase.
Date: August 1968
Creator: Chen, Evelyn Li-ming
Partner: UNT Libraries
open access

Preparation of N-Substituted Hydroxylamines from Oxaziridines

Description: In many series of compounds, intensity of biological activity and chemical reactivity are proportional. Generally whenever a alkyl group replaces a reactive hydrogen atom, as would be the case for an N-substituted hydroxylamine as compared to hydroxylamine, the over-all biological activity of the resulting compound is lower than that of its nonalkylated analogue. Since toxicity and physiological activity are not proportional, this comparison can only suggest possible types of derivatives to p… more
Date: January 1968
Creator: Truitt, Sharon G.
Partner: UNT Libraries
open access

Corrosion Inhibition with Quaternary Amines

Description: This thesis describes experiments made to test the corrosion inhibition of quaternary amines on steel.
Date: August 1969
Creator: Raiszadeh, Habib
Partner: UNT Libraries
open access

Amino Acid Complexes of Rhodium(III)

Description: This thesis will explore and study rhodium, a group VIII element that has rarely been studied.
Date: August 1965
Creator: Waller, James F.
Partner: UNT Libraries
open access

Synthesis of Selected 2-imidazolines

Description: Since Djerassi and Scholz found that 2-(aryloxy-methyl)imidazolines and their hydrochloride salts exhibit vasoconstrictive properties, the 1,2-(I) 1,3-(II) and 1,4-bis-(2-imidazolinylmethoxy) benzene (III) analogs (Fig. 1, p.2) were chosen for synthesis in order to test them for their effective vasoconstrictive characteristics and for whatever other physiological properties they might exhibit.
Date: June 1966
Creator: Maurer, Larry Eugene
Partner: UNT Libraries
open access

The Coupling Mechanism in the Organolithium-Organic Monofluoride Reaction

Description: In this work, the principal concern will be with the coupling reaction and it is anticipated that the other reactions referred to above will be considered further when products of the RX-R'Li reactions are discussed.
Date: May 1964
Creator: Carl, William P.
Partner: UNT Libraries
open access

Thermal Decomposition of Alkyllithium Compounds in the Pure State

Description: This thesis is concerned with the thermal decomposition of a series of alkyllithium compounds in the pure state in an attempt to determine the relative stability of alkyllithium compounds and to examine the mechanism of the elimination reaction.
Date: January 1965
Creator: Lin, Jacob Wen-pin
Partner: UNT Libraries
open access

Self-diffusion of Pb210 and Cl36 in Molten PbCl2-KCl Mixtures in the Region of the Compound 2PbCl2-KCl

Description: The specific goal of the investigation was the measurement, as a function of temperature, of the self-diffusion coefficients of Pb210 and Cl36 in PbCl2-KCl compositions in the region of the first compound, and to calculate from these data the activation energy necessary for the diffusion of these ions.
Date: June 1960
Creator: Tidwell, Troy Haskell
Partner: UNT Libraries
open access

Base Effects on the Thermal Decomposition of Sec-butyllithium Solutions

Description: The pyrolysis of sec-butyllithium in solution was studied in an attempt to understand the loss of stereo-specificity and the atypical kinetics that have been reported. Additionally, the effect of added lithium alkoxides was studied to determine their effects on the highly reactive sec-butyllithium substrate.
Date: June 1966
Creator: Adams, George Michael
Partner: UNT Libraries
open access

Electronic Effects in Dihaloketenes

Description: The objective of this investigation was to determine the electronic effects of the halogen atoms in dihaloketenes such as dichloroketene and dibromoketene.
Date: August 1966
Creator: Vaughn, Walter L.
Partner: UNT Libraries
open access

Cycloadditions of Dichloroketene

Description: An investigation of the cycloaddition behavior of dichloroketene with various types of olefins seemed in order to determine if dichloroketene behaved similarly to dialkylketenes. It was anticipated that a study of this type would indicate the reactivity of dichloroketene to various types of olefinic compounds and thus establish if the ease of cycloaddition with dichloroketene parallels the nucleophilicity of the olefin as it does in dialkylketenes.
Date: June 1967
Creator: Waters, Oralee Hurst
Partner: UNT Libraries
open access

Sodium Ion Self-Diffusion in Molten Mixtures

Description: This work is an extension of Yin's work studying the diffusion of Na ion in the PbCl2-NaCl system, but at more dilute compositions of NaCl.
Date: August 1963
Creator: Lu, Chi Chang
Partner: UNT Libraries
open access

A Study of Asymmetric Syntheses in Coordination Chemistry

Description: Since only one example of an asymmetric synthesis which involved an intermediate containing an optically active ligand has been reported, two questions immediately arise: "Is this type of asymmetric synthesis an isolated example, or is it a stepping stone toward a generalized trend for Co (III) which may be extended to include levo rotatory, as well as dextro rotatory molecules?" In addition, asymmetric synthesis affords a new avenue for synthesizing resolved neutral complexes.
Date: August 1963
Creator: Pennington, David Eugene
Partner: UNT Libraries
open access

Diffusion of Na²² in the Molten PbCl₂-NaCl System

Description: The object of this thesis is to establish the diffusion coefficient of Na ion in PbCl2-NaCl mixtures and to compare its relationship to the other species.
Date: August 1962
Creator: Yin, Shang-ming Helen
Partner: UNT Libraries
Back to Top of Screen