Physical Sciences and Mathematics Commons^™

23rd Rocky Mountain Conference

Rocky Mountain Conference on Magnetic Resonance

Abstracts and meeting program from the 23rd annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 2-6, 1981.

The Role Of Metals In Carcinogenesis: Biochemistry And Metabolism, K Wetterhahn Jennette

Dartmouth Scholarship

The oxyanions of vanadium, chromium, molybdenum, arsenic, and selenium are stable forms of these elements in high oxidation states which cross cell membranes using the normal phosphate and/or sulfate transport systems of the cell. Once inside the cell, these oxyanions may sulfuryl transfer reactions. Often the oxyanions serve as alternate enzyme substrates but form ester products which are hydrolytically unstable compared with the sulfate and phosphate esters and, therefore, decompose readily in aqueous solution. Arsenite and selenite are capable of reacting with sulfhydryl groups in proteins. Some cells are able to metabolize redox active oxyanions to forms of the elements …

Reactions Of (3-(Dimethylamino)-2-Azaprop-2-En-1-Ylidene) Dimethylammonium Chloride (Gold's Reagent) With Carboxylic Acid Derivatives And Grignard Reagents, Dale E. Polk

Retrospective Theses and Dissertations

An azavinamidium salt, [3-(Dimethylamino)-2-azaprop-2-en-l-ylidene] dimethylammonium chloride was reacted with primary amides, esters containing an ╬▒-methylene group and Grignard reagents. The reaction of this azavinamidium salt with amides and esters produced respectively, acyl amidines and enamino esters. Both of these products were produced in high yields by using relatively mild conditions. Reaction of the salt with Grignard reagents resulted in a novel synthesis of aldehydes. This aldehyde synthesis was shown to be of general utility and to proceed in high yields.

Structural And Magnetic Properties Of Co(Urea)₂Cl₂·2h₂O: A Two-Dimensional Lsing System With Hidden Canting, Richard Lewis Carlin, Kyong O. Joung, Andries Van Der Bilt, H. Den Adel, Charles J. O'Connor, Ekkehard Sinn

Chemistry Faculty Research & Creative Works

The characterization of Co(urea)₂Cl₂·2H₂O is reported. The crystal structure at ambient temperatures yields the following information: the chlorine, water, and urea group are coordinated, the urea being bound via the oxygen, to form an octahedral environment about the metal atom. Intermolecular hydrogen bonds between the coordinated chlorine and water ligands produce parallel infinite sheets which provide a two-dimensional exchange pathway. The sheets are separated by the urea ligands and may be considered as magnetically isolated from one another. Crystal data: space group P2₁/c, Z = 2, α = 7.397 (3) Å, b …

Diagenesis Of Organic Matter In Las Vegas Bay And Bonelli Bay, Lake Mead, James W. Murray, Carolyn J. Jones, Kathy Kuivila, Jeff Sawlan

Publications (WR)

The interstitial water chemistry of the sediments of Las Vegas Bay and Bonelli Bay in Lake Mead has been studied as part of a comprehensive water quality study of those locations. Pore water and solid phase analyses were completed from four stations in Las Vegas Bay and two stations in Bonelli Bay. At both locations the pore water compositions and organic matter diagenesis in the sediments are dominated by sulfate reduction. This major role of sulfate reduction is unusual for lake sediments and reflects the fact that SO₄ is the major anion in the lake water. In addition, gypsum …

Some Physical And Mechanical Properties Of Iron Calcium Silicate Glasses-Iron Composites, Hani Louis Rizkalla

Archived Theses and Dissertations

No abstract provided.

Electrochemical And Spectroscopic Studies Of Some Less Stable Oxidation States Of Selected Lanthanide And Actinide Elements, David Edward Hobart

Doctoral Dissertations

The technique of simultaneous observation of electrochemical and spectroscopic properties (spectroelectrochemistry) at optically transparent electrodes (OTE's) has been applied to the generation and characterization of some less stable oxidation states of selected lanthanide and actinide elements (Ce, Pr, Sm, Eu, Tb, Yb, U, Np, Am, and Cm) in complexing and noncomplexing aqueous solutions. Optically transparent electrodes used in this study included reticulated vitreous carbon (RVC) and metal screen OTE's and a new OTE made from porous metal foam (PMF).

Cyclic voltammetry at microelectrodes was used in conjunction with spectroelectrochemistry for the study of oxidation-reduction (redox) couples. In some cases additional …

Relative Stability Of Multiple Bonds To Silicon: An Ab Initio Study Of C2sih4 Isomers, Mark S. Gordon, Robert D. Koob

Mark S. Gordon

Ab initio (6-31G*/ /3-21G) SCF calculations have been carried out on 15 isomers with the chemical formula C2SiH4• The isomers include structures with formal double and triple bonds to silicon, as well as carbenes and silylenes, so a direct comparison of these types of species is possible. The isomerization energies provide an opportunity to consider the relative strengths of analogous bonds to carbon and silicon. With the appropriate isodesmic reactions, the stabilizing or destabilizing effects of substituents and strain in three-membered rings both may be investigated.

Structure And Stability Of A Silicon-Carbon Triple Bond, Mark S. Gordon, John A. Pople

Mark S. Gordon

The stability of the carbon-silicon triple bond in silaethyne is investigated via an analysis of its isomerization to silylidene and through a study of its hydrogenation energy relative to acetylene and silaethylene. It is found that silaethyne is rather unstable in a thermodynamic sense. However, while SCF calculations predict this species to rearrange to its more stable isomer with no barrier, the introduction of perturbation corrections suggests the existence of a small barrier separating the two isomers.

A Spectrophotometric Study Of The Rate Of Formation Of Violet Peroxychromate In Aqueous Solution, Stephen N. Witt

Honors Theses

The rate of formation of violet peroxychromate in aqueous solution was monitored spectrophotometrically at 540 nm. The method of initial rates enabled us to determine the exponents, x, y, and z, in the rate law for the violet species.

A Survey Of Detection Methods For Ovulation And A Proposed Method For Estrogen Determination, Maria Lanni

Honors Theses

A rapid, accurate method of determining the exact phase of a menstrual cycle at a given time is extremely important. This information is vital to doctors studying menstrual abnormalities and more importantly as an aid in conceptive and contraceptive decisions. Many methods based on changes in the body have been used to detect ovulation. These nonquantitative methods depend on the cyclical variations in basal boy temperature, physical and chemical properties of mucus and content of saliva. These changes are influenced by changing hormone levels. Specicially, estrogen levels rise several days prior to ovulation, therefore, methods for determining estrogen concentration in …

Synthesis Of Carbon Nucleosides : Potential Antibiotics, Jeffery Davis

Senior Scholar Papers

Abstract This paper deals with two synthetic routes designed to yield carbon nucleosides. The C-nucleosides are compounds of potential antibiotic utility. The first approach, designed to yield 4-(2'-deoxyribofuranosyl )-1 ,2,3-triazole (1), consisted of silylation of methyl vinyl ketone (4) to give 2-trimethylsilylosy-l,3-butadiene (6), followed by a crossed aldol condensation with a heteroaromatic aldehyde to yield the aldol l. Epoxidation and cyclization of l was expected to yield the target molecule ~. The initial step, silylation of methyl vinyl ketone (4), was successful. Using model compounds the second step of the synthesis was attempted. Numerous attempts to condense (6) with 2-pyridinecarboxaldehyde …

Comparison Of Toxicological Models For Evaluation Of Air Pollutants: Response Of The Pulmonary Alveolar Macrophage To Hexavalent Chromium, Jennifer Baker Galvin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was designed to accomplish two primary objectives: (1) to compare two test methods commonly used to evaluate toxicity of inhaled air pollutants, and (2) to observe the response as measured by each of the methods, of pulmonary alveolar macrophages exposed to 2μg hexavalent chromium.

The first method evaluated featured use of intratracheal injections to simulate live inhalation exposures, and the second required exposure of macrophages cultured on petri plates. Pulmonary alveolar macrophages harvested from Long Evans rats were used. The two cell function parameters measured in the evaluations were chemiluminescence and oxygen consumption (which was determined for cells …

The Transport And Intracellular Distribution Of Iron In The Basidiomycete, Ustilago Sphaerogena, Charles W. Passavant

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The transport and intracellular distribution of iron in Ustilago sphaerogena via the native siderochrome ferrichrome A has been examined. Evidence is presented which suggests the involvement of deferriferrichrome in iron transport when the metal is supplied to the cell as ferrichrome A. This process requires both oxygen and ATP synthesis and may require a transmembrane electrochemical gradient. Once inside the cell, iron derived from ferrichrome A is rapidly distributed, with a major fraction found in the mitochondria, presumably as heme.

The kinetics of ferrichrome and ferrichrome A uptake have also been investigated. The Km of transport of ferrichrome was …

Mechanism Of Two Homogeneous Reactions; Co Self Exchange And N2 Self Exchange, Alan L. Rockwood

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The two atom switching reactions referred to in the title were originally studied at temperatures greater than 2000°K in shock tubes by other investigators. For each reaction they proposed a direct four-center exchange mechanism in which one of the reactant molecules must be vibrationally excited, (the vibrational excitation mechanism or VEM). One of the predictions of the VEM is that molecules which are vibrationally hot but translationally cold should react through the four center transition state that leads to exchange.

Using a mercury photosensitization technique, it is shown in the present work that excitation of CO to high vibrational levels …

Cyclic Voltametry Studies Of Various Ylide Metallocenes, Mark Mojesky

Masters Theses & Specialist Projects

The redox potentials of [Fe(CpSMe₂)₂]²⁺ (CpSMe₂= dimethysulfoniumcyclopentadienflide), [Ni(CpSMe₂)₂]²⁺, [Co(CpSMe₂)₂]²⁺, [Mn(CpSMe₂)₂]²⁺, (CpPPh₃)HgBr₂ (CpPPh₃= triphenylphosphoniumcyclopentadienylide), (CpPPh₃)HgCl₂, and MoPC (PC = phthalocyanine) were examined using cyclic voltammetry (CV). The experimentation was carried out in a temperature controlled environment. With the exception of the mercury and molybdenum complexes, the solvent system consisted of 15 milliliter mixture of acetonitrile and water. Due to the solubility problems of the mercury bromide complex, …

The Anodic Stripping Voltammetric Analysis Of Chromium Using The Hanging Mercury Drop Electrode, John Fugate

Masters Theses & Specialist Projects

The Hanging Mercury Drop Electrode (HMDE) is used in the anodic stripping analysis of ppm concentrations of chromium. The effects of such parameters as ionic strength, polymeric film formation, and the use of the chromate-sodium acetate standard are interpreted in terms of the electro-chemical and physical properties of chromium in the +3 and +6 oxidation states.

Theory And Intuition, E. A. Mccullough Jr.

Faculty Honor Lectures

Among the practitioners of science are people who are called theorists , and this lecture is concerned with the question, Just what is it that a theorist does?

If an experimentalist does experiments, then a theorist presumably does theories. What is a theory? My dictionary defines it as ". . . a system of assumptions, accepted principles, or rules of pro· cedure devised to analyze, predict or otherwise explain the nature or behavior of a specified set of phenomena."

Those who now understand perfectly what a theorist does may stop reading here because everything that follows will be superfluous. For …

High Performance Liquid Chromatographic Analysis Of Biogenic Amines, Thais Edwina Ahrendt Keegan

Chemistry & Biochemistry Theses & Dissertations

The objectives of this research were to develop a sensitive method for separation and quantitation of biogenic amines and to apply that procedure by monitoring neurochemical changes resulting from stimuli to the test system.

Primary aromatic amines were derivatized with o-phthalaldehyde-mercaptoethanol prior to chromatography, Separation of the fluorescent adduct was achieved using a μBondapak/ phenyl reversed-phase column and a two-step gradient of methanol:0.08 M acetic acid, pH J.O. Fluorescence was monitored using a J40 nm excitation energy and an emission filter which transmits radiation greater than 400 nm (50% T at 418 nanometers).

Following optimization of the chromatographic conditions, studies …

A Technique For The Isolation And Identification Of Aliphatic Amines In Water, Peter Alan Drew

Chemistry & Biochemistry Theses & Dissertations

Small, aliphatic amines added to a basic, aqueous solution (16.2 L) at a concentration of 100 parts per billion were isolated by sorption on a small column of macroreticular resin. The amines were eluted with diethyl ether; the eluate concentrated, and the compounds separated and identified by gas chromatography. The efficiency of the recovery of a-nines ranged from 5 to 28%.

A protocol for derivatizing pyrrolidine and n-pentylamine in ether with fluorinated acylating agents was developed. The method was found to be adequate for the detection of approximately 13 micrograms of &-nines in concentrated ether extract.

Environmental water samples …

Chemistry Of Organic N-Chloramines, Formation Of Arenesulfonamides By Derivatization Of Organic N-Chloramine With Sodium Arenesulfinate, Katherine F. Bowdring

Chemistry & Biochemistry Theses & Dissertations

Organic N-chloramines are recognized by-products of chlorinated water systems. Because of their chemistry, none have been isolated or identified.

This paper discusses a method for the derivatization of the organic N-chloramines based on a nucleophillic substitution mechanism. N-Chloro derivatives of amines of various structures were studied including primary and secondary aliphatic amines, as well as amino acids. The effect of the presence of other functional groups including aromatic and unsaturated systems was investigated.

Derivatization was done by three different methods, one involving derivatization of the pure N-chloramine, and two involving derivatizations of the N-chloramine generated in situ. Seventeen arenesulfonamides have …

Determination Of Diffusion Coefficients Of Ions In Gels, Kelly A. Sanderson

Theses & Honors Papers

No abstract provided.

A White Ammonia Fountain, John T. Moore

Faculty Publications

Red, white, and blue ammonia fountains are a stunning addition to chemistry magic shows.

Classical Demonstrations Performed To A New Beat, John T. Moore

Faculty Publications

Music can help fill the gaps in time during demonstrations and make demonstrations more exciting.

A Rolling Laboratory Platform For The Mobility Handicapped, John T. Moore

Faculty Publications

Portable laboratory stations designed for use by the mobility handicapped are available, but the expense of these precludes their use by many institutions. These authors share a more affordable solution.

Expansion Approach To Photodissociation Dynamics. I. Theory, Kazuo Takatsuka, Mark S. Gordon

Mark S. Gordon

We propose a new formulation for a photodissociation process to which an expansional (or algebraic) quantum‐variation‐method of scattering is applicable. By solving a ’’full collision’’ problem which describes a multichannel process on the repulsive surface, the photodissociation scheme takes account of interchannel coupling from the outset. Our expression for the amplitude of the partial linewidth is similar to that of the ’’half‐collision’’ approximation of Jortner e t a l. The present formalism differs in that the scattering wave functions take acount of interchannel coupling exactly. As a result, only on‐the‐energy‐shell contributions appear in the partial linewidth.

Expansion Approach To Photodissociation Dynamics. Ii. Correction Formula For Linewidth And Numerical Examples For Hcn, Kazuo Takatsuka, Mark S. Gordon

Mark S. Gordon

A correction formula for energy disposal and linewidth of photodissociation dynamics is proposed. This formula was derived from an identity similar to the Kato identity of the scattering theory. Thanks to the correction formula the resultant linewidth turns out to be more accurate and stable even when a relatively poor basis set is used. Numerical examples for assumed direct dissociation of HCN, DCN, and TCN and for the predissociation of HCN and DCN are presented.

Centers Of Polymer Research; Polymer Science In Kyoto, Japan, Otto Vogl, A. Nakajima

Otto Vogl

No abstract provided.

Effects Of N2h4 On The Transition Temperature In The Anisotropic Superconductor Tase3, K. Yamaya, T. H. Geballe, Juana Vivó Acrivos, J. Code

Faculty Publications, Chemistry

No abstract provided.

Conduction Band Symmetry In Ta Chalcogenides From Ta L Edge X-Ray Absorption Spectroscopy (Xas), Juana Vivó Acrivos, S.S. P. Parkin, J. Code, J. Reynolds, K. Hathaway, H. Kurasaki, E. Marseglia

Faculty Publications, Chemistry

No abstract provided.