Chemistry Commons^™

Resonance Absorption Of P-Benzosemiquinone In The Zeeman Region, Juana Vivó Acrivos

Faculty Publications, Chemistry

No abstract provided.

The Effect Of Charged Interfaces On The Ionic Distribution In Solution, Myron Elliot Feinstein

Dissertations, Theses, and Capstone Projects

No abstract provided.

Resonance Absorption Of P-Benzosemiquinone In The Zeeman Region, Juana Vivó Acrivos

Juana Vivó Acrivos

No abstract provided.

Vapor Pressure And Heat Of Sublimation Of Gallium Acetylacetonate, Arthur John Massey

Dissertations, Theses, and Masters Projects

No abstract provided.

Liquid Scintillators. The Stability Of Organic Scintillator Solutes Toward Ultra-Violet Radiation. The Photooxidation Of 2, 5-Diphenyloxazole., Harold A. Mackay

Chemistry and Chemical Biology ETDs

An insight has been gained concerning the stability of organic scintillator solutes in toluene on exposure to ultraviolet light while in the presence of oxygen and water. Oxygen and water, from either solute or solvent, not only function as quenchers but may continue to react with the solute molecule via a photooxidation process. Removal of these materials from the 2, 5-diphenyloxazole toluene system resulted in a marked improvement in stability of the system on exposure to ultraviolet light. The choice of scintillator solute, in addition to water and oxygen, and the time of ultraviolet irradiation, has a pronounced effect on …

Polarographic Investigation Of Several Tetrakis 1, 3-Diketone Europium Chelates In Acetonitrile, Samuel Lee Jeanjaquet

Chemistry and Chemical Biology ETDs

This study is concerned with the polarographic behavior of several tetrakis 1, 3-diketone chelates of europium and of the 1, 3-diketone ligands in acetonitrile. Such a study should reveal the following: (a) whether the europium (III) in the complexes is reduced directly to the metal, or if reduction to europium (II) takes place followed by reduction to the metal; (b) whether ligands are released during the reduction step(s) and if so, how many; (c) whether the polarographic behavior is such that dissociation constants of the complexes or complex ions can be determined by measuring the shift in half-wave potential as …

Spin-Resonance Transitions Of Free Radicals In The Zeeman Region, Juana Vivó Acrivos

Faculty Publications, Chemistry

No abstract provided.

Spin-Resonance Transitions Of Free Radicals In The Zeeman Region, Juana Vivó Acrivos

Juana Vivó Acrivos

No abstract provided.

Liquid Scintillators: Some 3-Aryl-L,2-Dihydronaphthalenes, 3-Aryl-1,2-Dihydro-4-Methylnaphthalenes, 3-Aryl-1,2-Dihydrophenanthrenes And 3-Aryl-1,2-Dihydro-4-Methylphenanthrenes: Steric Effects Of The Methyl Group, Lavinel G. Ionescu

Chemistry and Chemical Biology ETDs

scintillation and Fluorescence

There are two methods commonly employed for the measurement of radiation: the ionization chambers, such as the various types of Geiger­Mliller tubes, and the scintillation counters.

The scintillation process involves the emission of discrete light flashes when a substance called phosphor or scintillator is struck by radioactive or other energetic particles. In fact, the word scintillator, comes from the Latin scintilla which means spark. Scintillation is related to fluorescence. The emission spectra for the two phenomena are almost identical, the difference between the two processes lying mostly in the method of excitation. In the case of fluorescence …

Water Chemistry Survey Of Boulder Basin, Lake Mead, P. R. Tramutt, Bureau Of Reclamation

Publications (WR)

The survey results indicate that the impoundment of water behind Hoover Dam has not adversely affected the dissolved oxygen (DO) content and that water quality and DO content were uniform regardless of depth. The study made in April-May 1964 will provide water quality data of Lake Mead prior to releases from Lake Powell as a basis for evaluating Lake Powell's effect on water quality and limnology of Lake Mead. The performance of a DO analyzer was tested and found unsatisfactory at depths below 150 ft. Parameters tested by standard chemical analyses of water samples in the Denver Laboratory and by …

Intramolecular Spin-Orbit Coupling In Naphthalene Analogs, Francis Elliott Shoup Iii

Chemistry and Chemical Biology ETDs

The objective of this study was to gain additional insight into the phenomenon of spin-orbit coupling in molecules by examining the intramolecular mechanisms responsible for the phosphorescence of certain types of molecules. Spectrocopic investigations of a series of aromatic hydrocarbons, aromatic heterocyclics, and some of their halogen derivatives are reported. Experimental measurements included absorption spectra, total emission spectra, polarized emission spectra, obtained by the method of photoselection, and radiative lifetimes.

Crystal Field Splitting In Rare Earth Chelates, Walter George Perkins

Chemistry and Chemical Biology ETDs

Investigations of ligand field effects in the spectra of trisdibenzoyl­methide, trisbenzoylacetonate, and trisacetylacctonatc chelates of trivalent ytterbium and thulium are reported. Chelate absorption and luminescence spectra corresponding to intra-4f electronic transitions exhibit line split­tings similar in magnitude to the crystal field splitting observed in the spectra of inorganic complexes of the rare earth ions.

Absorption spectra of carbon tetrachloride solutions of all the che­lates studied were measured in the visible and near infrared regions. Each ytterbium chelate exhibits an absorption band at 9800A, consisting of three well-resolved peaks. Thulium intra-4f absorption bands appear at 4700A, 6800A, 8000A, 12000A, and 17000A. …

Spectroscopic Studies Of Tris (2,2'-Bipyridine)- And Tris (I, 10-Phenanthroline) Iron (Ii), -Ruthenium (Ii), And -Osmium (Ii)., Sonia Lee Sabath

Chemistry and Chemical Biology ETDs

The tris(2,2'-bipyridine)- and tris(l,10-phenanthroline) complexes of iron(II), ruthenium(II), and osmium(II) were synthesized, purified, and characterized by analyses. The solution absorption spectra of the compounds were measured both in the ultraviolet and visible regions. The observed ultraviolet absorption bands of the ruthenium and osmium complexes were assigned entirely to transitions, the prominent bands being assigned to ligand (perturbed) transitions by comparison with the published assignments of the corresponding bands in analogous iron complexes. The visible absorption spectra for iron(II) and ruthenium(II) complexes were attributed entirely to singlet-singlet charge transfer transitions. The strong visible absorption bands of osmium(II) complexes were also assigned …

The Synthesis And Evaluation Of Some 2-Arylindenes And 2-Aryl-3h-Benz[E]Indenes As Liquid Scintillation Solutes, James Leslie Schornick

Chemistry and Chemical Biology ETDs

A scintillator, in the chemical sense, is a system which can convert radioactive particle energy to visible and near ultraviolet photon energy. A phenomenon related to scintillation is fluorescence. The difference between scintillation and fluorescence is the source of excitation energy. In the case of scintillation, the exciting energy comes from radioactive particles, while in fluorescence, the exciting energy comes from ultraviolet light.

Potential Diuretic Agents;The Synthesis Of 4, 7-Disubstituted Derivatives Of 2-Phenylimidazo [4, 5-D]Pyridazine., Miriam P. Malm

Chemistry and Chemical Biology ETDs

"The maintenance of the water balance of an organism is of prime importance for its physiologic well-being." (1) Water, which composes approximately two-thirds of the entire human body weight, is the fluid in which all vital chemical reactions occur. A loss of 25 percent of body water usually proves fatal. The inherent physical and chemical properties of water render it as the ideal fluid to meet the physiological demands of the organism.

Energy Migration In Rare Earth Complexes, John Jerome Freeman

Chemistry and Chemical Biology ETDs

Complexes of trivalent samarium, europium, terbium, and dysprosium were prepared for investigations of the luminescence properties of complexed rare earth ions. Rare earth chilates derived from benzoylacetone, dibenzoylmethane, and acetylacetone; rare earth chlorides solvated with water and deuterium oxide; and rare earth oxides dissolved in sodium metaphosphate glasses were synthesized for these studies.

Radiochemical Studies: Isotopic Exchange Reactions, Solvent Effects, Preparation And Properties Of Carrier-Free Amalgams, Hans L. Hamster

Chemistry and Chemical Biology ETDs

The work described in this section is concerned with the kinetics of an S_N2 reaction, the isotopic exchange reaction between iodide ions and p-nitrobenzyl iodide, carried out in an aprotic solvent, acetone, in the presence of various substituted phenols and anisole. This reaction was carried out at concentration of potassium iodide low enough to insure the absence of ion pairs.

An Investigation Of Steric Inhibition Of Resonance In Liquid Scintillators, Richard L. Taber

Chemistry and Chemical Biology ETDs

It is well known that the replacement of two or more of the ortho hydrogen atoms in the benzene rings of biphenyl by lager atoms or groups hinders the rotation about the l.l'-carbon single bond in the biphenyl system. If the groups are so large that they are unable to pass each other upon rotation of the l,l'-bond, then the two benzene rings are forced to assume a non-planar configuration.

Self-Diffusion In Single-Crystal Tungsten And Diffusion Of Rhenium Tracer In Single-Crystal Tungsten, Robert L. Andelin

Chemistry and Chemical Biology ETDs

Self-diffusion in single-crystal tungsten and diffusion of rhenium tracer in single-crystal tungsten have been measured over the temperature range 2660 C to 3230 C by the direct sectioning technique. The initial radioactive layer of tungsten and rhenium tracers was produced on the diffusion samples by bombardment with 9. 0-MeV deutrons. It was shown that the initial radioactive layer satisfactorily approximated the boundary-condition requirements of the one-dimensional diffusion equation. The tracers observed in determining the diffusion coefficients were W^185, Re^183, and Re^184.

The Kinetics Of The Hydrolysis Of Some 2-Imidazolines, Bobby G. Harnsberger

Chemistry and Chemical Biology ETDs

In recent years, 2-imidazolines have become important industrially. Possible applications include uses as drugs, fungicides, emulsifying agents, demulsifying agents, corrosion inhibitors, fuel oil additives and gasoline additives.

Hints On Irrigating Citrus With Saline Water, Stanley Thomas Smith

Journal of the Department of Agriculture, Western Australia, Series 4

IN the past few years a number of citrus orchards near Perth have shown signs of damage caused by excess "salt" (chloride) uptake. All have been irrigated either from the Canning River or from private bores or dams.

Senior Soil Research Officer S. T. Smith describes glasshouse experiments which have given some useful guides to minimising "salt" damage in citrus trees irrigated with low-quality water.

The Analysis Of Seed Oils Of Six Tropical Plant Species By Gas Chromatography, Justin C. Hamer

Chemistry and Chemical Biology ETDs

Several factors influenced the choice of tropical plant seeds studied in this research. Among these factors were: (1) an early interest in the chemistry of natural products; (2) the legends surrounding the use of certain plants by native herb "doctors," and (3) the ready availability of the materials at the beginning of this investigation, which was started in Cuba.

A Spectroscopic Study Of Some Rare Earth Complexes, Richard M. Alire

Chemistry and Chemical Biology ETDs

The phenomenon of intramolecular energy transfer was studied using anthranilate, 8-hydroxyquinolate, 2-methyl-8-hydroxyquinolate, and salicylaldehyde rare earth chelates. Line emission characteristic of the rare earth ion was observed whenever the lowest triplet (measured) of the complex was higher in energy than the emitting (resonance) level of the rare earth trivalent ion. The path of energy transfer from the organic portion of the chelate to the rare earth ion was verified as going via the lowest or a nearby triplet state of the complex.

High Temperature Vaporization Behavior And Thermodynamic Properties Of Hafnium Diboride, Milton C. Krupka

Chemistry and Chemical Biology ETDs

Vaporization of hafnium diboride has been studied in a tungsten effusion cell over the temperature range 2175 degrees K. to 2500 degrees K. A low-melting eutectic at 2520 degrees K. prevented the use of the effusion cell technique at higher temperatures.

The Kinetics Of The Exchange Of Chlorine Atoms Between Hydrogen Chloride And Benzyl Chlorides, Warren Bruce

Chemistry and Chemical Biology ETDs

The study of the rates of chemical reactions in solutions has received a great deal of attention, primarily because of the relative ease with which such investigations can be persued; however, the great number of publications can never obscure the truth that a rigorous treatment of molecular processes in solutions is not available. The approach to the problem has been through extensions of theories which have their origins in descriptions of gaseous systems, and, with few exceptions, these extensions are firmly grounded on the techniques of classical thermodynamics. Hopefully, future advances in the calculation of the partition functions of molecules …

The Synthesis And Medicinal Chemical Study Of Some Pyridazones, Winnifred M. Osner

Chemistry and Chemical Biology ETDs

An examination of the literature revealed that the majority of pyridazines prepared were substituted in the three and six positions. Therefore, it appeared appropriate to prepare four and five substituted pyridazines.

Application Of The Sideband Technique To Wide-Line Nmr Spectra, Juana Vivó Acrivos

Faculty Publications, Chemistry

No abstract provided.

Application Of The Sideband Technique To Wide-Line Nmr Spectra, Juana Vivó Acrivos

Juana Vivó Acrivos

No abstract provided.

An Investigation Of The Isotopic Exchange Of Arsenic Atoms Between Arsenic(Iii) And Arsenic(V) In Aqueous Hydrochloric Acid Solutions, Lewis L. Anderson

Chemistry and Chemical Biology ETDs

A spectrophotometric investigation was initiated in order to provide additional evidence for the existence of chemically nonequivalent species of arsenic(V) in 10.9 f hydrochloric acid solution.

Phase Equilibria In Fused Salt Systems: Binary Systems Of Plutonium(Iii) Chloride With The Chlorides Of Magnesium, Calcium Strontium, And Barium, Karl W. R. Johnson

Chemistry and Chemical Biology ETDs

Fused salt systems containing oxides have received the most attention to date, because of their occurrence in minerals and ores and their application to ceramics. The next most widely studied of group of compounds are the metal halides, particularly the metal chlorides. Despite the fact that many of the metal chlorides are hygroscopic, the salts lend themselves to experimentation because a large majority undergo stable solid-liquid transformations below 1000 degrees C, are generally ionic, and are relatively non-corrosive.