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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
The Design, Development And Construction Of A Low Cost Multi-Purpose Computer/Interface System For On-Line Experimentation: Applications To Time Averaging Of Nmr Spectra And Other Chemical Instrumentation Problems, Steven A. Carr
Honors Theses
The project goal was the development of a low cost multipurpose microprocessor interfacing system that would be adaptable to a number of commonly encountered chemical instruments (such as NRM, GC, IR, and UV-VIS.) for the purpose of control, data acquisition processing. The Altair Microprocessor with 4K random access memory was constructed from kit form; it functions as the computer portion of the system. The digital to analog and analog to digital signal conversion elements as well as timing, control and other necessary logic functions are incorporated in the electronic interface portion of the system. The computer, interface, principles of time …
The Synthesis And Decomposition Of O-Substituted Phenylhydroxylamines, Helen Carol Kennicott
The Synthesis And Decomposition Of O-Substituted Phenylhydroxylamines, Helen Carol Kennicott
Honors Theses
0-(phenyl)hydroxylamine and its p-nitrated derivative were synthesized for use in a study of substitution reactions at an sp3 hybridized nitrogen atom. The 0-(phenyl)hydroxylamine was decomposed thermally in several nonnucleophilic solvents and in water, with base present. It is proposed that in organic solvents, the decomposition proceeds by a radical mechanism involving a solvent cage intermediate. Ammonia and aminophenols are the major products. In water, it appears that an SN1 reaction producing phenoxide may compete with the radical mechanism.
The Synthesis Of 2, 11-Dithiabenzo - [3.3] - Paracyclophane And An Octadeutero Derivative, Paul M. Begley
The Synthesis Of 2, 11-Dithiabenzo - [3.3] - Paracyclophane And An Octadeutero Derivative, Paul M. Begley
Honors Theses
The purpose of this work was the synthesis of 2, 11 -dithia-benzo- [3.3] -paracyclophane and its octadeutero derivative 2,11-dithia- 3,3, 5, 6, 8, 9, 10, 10-octadeutero-benzo - [3.3] paracyclophane. A comparison of their nuclear magnetic resonance spectra as well as their mass spectra will unequivocably provide proof of their successful synthesis.
Ozone Complexes With Substituted Aromatic Compounds, David C. Eaton
Ozone Complexes With Substituted Aromatic Compounds, David C. Eaton
Honors Theses
Ozone has been observed to complex with aromatic compounds at low temperatures. The ability of an aromatic system to complex with ozone appears to be due to the inductive effect of the substituent on the pi system. The experimental work was done in the solid phase at temperatures of -175° C to -186° C. Under these conditions all the substituted aromatics with electron withdrawing groups did not complex including benzene. The complexes are highly colored. To insure the reversibility of the pi complex, infrared spectra were taken of some of the aromatic species before and after complexing.
A Facile One Step Synthesis Of Some New 2-Hydroxy-4,6-Bis Aryl S-Triazines And Related Compounds, Howard Steven Grossberg
A Facile One Step Synthesis Of Some New 2-Hydroxy-4,6-Bis Aryl S-Triazines And Related Compounds, Howard Steven Grossberg
Honors Theses
In the past few years the symmetrical triazines have developed extreme importance in biochemical research as well as importance in industrial applications. In our research we have developed a facile, one-step synthesis of a number of 2-hydroxy-4, 6-bis aryl symmetrical triazines based upon the addition of the anion of urea and an aromatic nitrile, with the aryl group including a number of halogenated benzenes, pyridine, or benzene itself. The structure of these compounds had been proved by microanalysis and by both infra-red and mass spectroscopy. The further versatility of the synthesis has also been explored, and by replacing the urea …
The Preparation And Kinetic Studies Of Two Sterically Hindered Gold (Iii) Complexes, James Forrest Stevens
The Preparation And Kinetic Studies Of Two Sterically Hindered Gold (Iii) Complexes, James Forrest Stevens
Honors Theses
Previous studies indicate substitution of bromide ion for chloride ion in [Au(Et4dien~H)c.i] +occurs at a rate almost independent of the bromide ion concentration, while similar reactions with [Au(dien-H)Cl]+, [Au(Me2dien-H)c!]+ and [Au(Me4dien-H)c~+ show rates dependent on bromide ion concentration as usually encountered for square planar complexes. There is retardation of the reaction by steric and electronic effects with increased N-alkyl substitution of the triamine. It has also been postulated that substitution of [Au(Et2dien-H)cJ]+ proceeds via a ring-opening mechanism. The purpose of this research was to study further the effect of steric hindrance on rates of substitution of two additional gold(III) complexes. …
Effect Of Solvent Polarity On The Singlet-Triplet Energy Gap Of Methyl-2-Anthroate, William Gregg Hawkins
Effect Of Solvent Polarity On The Singlet-Triplet Energy Gap Of Methyl-2-Anthroate, William Gregg Hawkins
Honors Theses
Nonradiative processes cause the fluorescence quantum yield to be less than one. Elucidation of nonradiative decay mechanisms without knowing the location of triplet states is difficult. Determination of the fluorescence quantum yield (Øf) as a function of temperature can provide valuable information about relative location of triplet states and the nonradiative processes which result from having a triplet near the energy of the first excited singlet state. Methyl-2-anthroate is very sensitive to solvent polarity. The Øf values and S1 energies vary greatly, depending on the solvent environment. Temperature studies on Øf have indicated the intersystem crossing (ISC) to a nearby …