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Preparation And Properties Of Benzotropones And Benzohomotropones, Robert E. Suder

Dissertations

No abstract provided.

21st Rocky Mountain Conference On Analytical Chemistry

Rocky Mountain Conference on Magnetic Resonance

Abstracts and meeting program from the 21st annual meeting of the Rocky Mountain Conference on Analytical Chemistry, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, July 30 - August 1, 1979.

Synthesis And Characterization Of Bis(Fulva1ene)- Divanadium And The Crystal Structure Of Its Oxidation Product, Bis(Fulvalene)Bis(Acetonitrile)Divanadium(Iii)- (V-V) Bis(Hexafluorophosphate)-Acetonitrile (1/1), James Smart, Barry Pinsky, Michael Fredrich, Victor Day

Chemistry Department: Faculty Publications

Because of the current interest in the structure and reactivity of coordinatively unsaturated metallocenes and the formally analogous metallofulvalene derivatives, we wish to report our initial synthetic, physical, and X-ray structural studies of the bis( fulva1ene)divanadium system.

Comment On "Depolarized Rayleigh Spectroscopy From Benzonitrile", Scott Whittenburg

Chemistry Faculty Publications

No abstract provided.

Isomerization And Dehydrocyclization Of 1,3-Pentadiene, Thomas E. Marcinkowski

Retrospective Theses and Dissertations

Piperylene concentrate is a complex mixture of 5-carbon unsaturated hydrocarbons obtained as a by-product when naphtha or gas oils are cracked. The major component in this mixture is 1,3-pentadiene. During the course of this study, a number of trials, utilizing liquid phase reaction conditions, were made to investigate the geometric isomerization of 1,3-pentadiene and its separation from the piperylene concentrate. Isomerization was accomplished employing catalytic amounts of iodine at temperatures ranging from 0°C to reflux. Using this method, the maximum amount of trans-1,3-pentadiene obtained was 70% as compared to 51% in the piperylene concentrate. Recovery of the product was 90%, …

Thermal Effects On The Optical Spectra Of A Polydiacetylene: Poly{1,2-Bis [4-(Isopropylcarbamoyloxy) -N-Butyl]-1-Buten-3-Ynylene}, H. Eckhardt, Craig J. Eckhardt, K.C. Yee

Craig J. Eckhardt Publications

The reflection spectra of single crystals of the polydiacetylene, IPUDO [R= (CH₂)₄OCONHCH (CH₃)₂], were measured between 25° C and 160° C. A nearly reversible thermochromic change is observed together with a variation of hysteresis upon cycling. The latter is attributed to annealing that permits the pendant groups to adopt a conformation which favors the butatriene-type configuration of the polymer at high temperatures. Intensities of the high and low temperature spectra obtained by Kramers–Kronig transforms are in excellent agreement with the spectral intensities of polydiacetylenes which are prototypes for the two configurations.

Co2 Laser-Induced Decomposition Of Freon 113, Jeffrey Joseph Rusik

Honors Theses

Gasgeous freon 113, or CC12FCC1F2, was irradiated with a continous wave carbon dioxide infared laser. The rat of formation of CF2CC1F, a decomposition product, was monitored using an infared spectrometer. The initial rates or product formation were related to irradiation wavelength and power, and the laser induced reaction was related to pyrolysis decomposition. A computer program which calculates the temperatures in a laser beam is modified and applied to the irradiations performed. It is determined that bi- or triphotonic absorption is occuring and that the laser induced reactions are photocatalyzed. A reaction model is discussed which combines thermal excitation, multiphotonic …

Ozonolysis Of Certain Alpha, Beta-Unsaturated Carbonyl Compounds, Alan Howard Wynn

Honors Theses

One of the intermediates in the ozonolysis of alkynes is the α carbonyl carbonyl oxide. The Hull rearrangment mechanism suggests that the α carbonyl carbonyl oxide can then rearrange via a rotation and cuclization to an anhydride.

Peroxidase And Senescence, Michael Jay Chaskes

Honors Theses

Kinetin and α, α1 - dipryridyl prevented the rapid decrease of chlorophyll content in oat leaf intact segments senescing in the dark.

Synthesis Of Sterically Hindered Disasters, Richard A. Bankowitz

Honors Theses

This thesis examines the synthesis of two sterically hindered diesters, neopentyl glycol dipivaloate and ditert-butyl 2, 2-diethylmalonate. The implications of this hinderance for hydrolysis in basic medium are discussed. The neopentyl glycol diester of 2,2-dimethylpropanoic acid is prepared with little difficulty by reaction of the glycol with the acid chloride in the presence of pyridine. The process gives the desired ester in approximately 66% yield. The preparation of the ditert-butyl ester of diethylmalonic acid is also attempted by means of the acid chloride in the presence of pyridine. Preparation of the diethylmalonyl dichloride using acetonitrile as a solvent in most …

Kinetic Study Of The Chelate Ligand Unwrapping Reactions Of Sterically Hindered Gold (Iii) Complexes, James W. Thackeray

Honors Theses

The complexes [Au(Et2dien_H)Br]PF6, [AU(Me4dien_H)Br]Pf6, and [Au(Et3dien_H)Br]PF6 have been sunthesized and a kinetic study of their conjugate acids performed. This paper centers on the direct replacement of the tridentate ligang on the complex by bromide ion.

Preparation And Kinetics Of Chloro-1,4,7-Triethyldiethylenetriamine Gold (Iii), Paul Lawrence Sargent

Honors Theses

The square-planar complex has been synthesized and its aqueous solution chemistry investigated. The rate of bromide substitution for chloride has been studied along with the rate of the chelate un-wrapping reaction for the bromo-complex. These results aer compared with work on previously studied gold complexes.

Calculation Of Mono-Cyclic Molecular Structures Using Mindo/3, Peter Mark Felker

Honors Theses

Molecular geometries of selected, small cyclic compounds were calculated using the semi-epirical, S.C.F. molecular orbital method MINDO/3. Calculated geometries are compared with experiemental values to determine MINDO/3's effectiveness. It is found that the method has several systematic deficiencies. In Particular, carbon-oxygen single bond distances are calculated to be too short.

Study Of Cndo/2 For The Prediction Of Geometries Of Phosphorus-Containing Molecules, Mark A. Fraser

Honors Theses

The method of CNDO/2 is presently being used to study the mechanisms of hydrolysis of phosphate esters. The question, therefore, arises whether or not CNDO/2 can accurately predict the geometries of phosphorus containing molecules. Using an optimizer adapted from the method of Rosenbrock, 41 compounds were tested.

Examination Of The Acid Etching Process Used In Preventative Dentistry, Robert Charles Morgan

Honors Theses

Nuva-Seal is a bisphenol-A-glycidyl-methacrylate monomer which in its polymerized form seals a tooth to prevent carie formation. Prior to application the tooth surface is pretreated with an etching solution to increase the bond strength. The etchant solution is 50% by weight H3PO4 and 7% by weight Zn0. Previous investigations preformed at Union College have determined qualitatively that a substantial portion of enamel is removed by the acid pretreatment. In addition, an extensive literature search into the development of the etching process was performed in order to validate or repute its usefulness.

Crystal Structures Of A₂Fecl₅·H₂O (A=Rb⁺, Cs⁺) And Field Dependent Superconducting Susceptometer Measurements, Charles J. O'Connor, Bascom Sine Deaver, Ekkehard Sinn

Chemistry Faculty Research & Creative Works

Crystal structures and low field principal crystal axis magnetic measurements are reported for the antiferromagnetic iron (III) salts A₂FeCl₅·H₂O; A=Rb⁺, Cs⁺. The two compounds undergo a zero field paramagnetic to antiferromagnetic phase transition at 6.5 K (A=Cs⁺) and 10.05 K (A=Rb⁺). The spin flop magnetic phase is observed in high field measurements. The magnetic field-temperature phase diagrams are reported. All magnetic measurements were recorded on a superconducting susceptometer. The bicritical points are 6.25 K, 14.5 kOe (A=Cs⁺), 9.75 K, 17.8 KOe (A=Rb⁺). …

The Concentration And Speciation Of Sugars In Natural Waters, Minoo Shakerin Sweet

Dissertations and Theses

Due to the importance of carbohydrates in biological systems, many efforts have been made to develop a quantitative method for analysis of carbohydrates in natural waters. The low concentrations of dissolved sugars in natural waters require a sensitive analytical method. In this study, gas chromatography of alditol acetate derivatives of sugars was investigated for quantitative and qualitative analysis of individual dissolved sugars in natural waters. The alditol acetate derivatives of sugars give only one derivative for each sugar, yielding qualitative and quantitative results.

The detection limit was 25 nM for each sugar. Because of this very low detection limit, only …

Surface Tensions Of Molten Salt Mixtures, Jerry Goodisman

Chemistry - All Scholarship

It is always found that the surface tension of a mixture of molten salts lies below the mean of the surface tensions of the pure components, weighted by mole fractions. Part of this effect is certainly due to the well-known fact that the composition near the surface is enriched in the component of lower surface tension. We show that an effect of the long-range forces, present for fluids involving Coulombic interactions, is of greater importance. The effect is due to the electroneutrality constraint on the distribution functions. As we show by separate calculations, both effects must be considered to obtain …

The Effects Of Bridging Ligands On Anodic Stripping Voltammetric Analysis, Larry Beasley

Masters Theses & Specialist Projects

Anodic stripping voltammetry (ASV) is an electroanalytical method used in the determination of trace metals in solutions volumes of 20 milliliters or less. Generally, 10^-6 M concentrations are routinely analyzed.

The analysis of Zn(II), Cd(II), and Cr(III) by ASV was Investigated, and the effects of introducing the bridging ligands, cyanide and thiocyanate into solutions of these metal ions was examined. These effects include a cathodic shift in the reduction potentials of the metals, and ASV signal changes ranging from small increases in peak currents to a total loss of peak-current signals, depending on the concentration of the ligand added.

Preparation Of A Polymer Supported Cobalt (Ii) Schiff Base Catalyst, Susan L. Fuhrman

Retrospective Theses and Dissertations

Polystyrene bis(salicylaldehyde)-propylene-1,3-diiminato Cobalt (II) (salen) and Polystyrene bis(acetylacetone)-propylene-1,3-diiminato Cobalt (II) (BAE) were prepared stepwise from polystyrl chloride. The reaction series included substitution of the chloride with a malononitrile carbanion, reduction to a diamine, condensation to form a Schiff base, and complexation with Co(II) acetate to form the active polymeric material. Optimum conditions with regard to time, temperature, reaction ratios, and solvent were determined for each reaction. The ability of the polymer bound cobalt complex to oxidize 3-methyl indole was measure. The BAE catalyst yielded a large amount of the corresponding o-formylaminoacetophenone. However, the exact yield is not known because product …

Photon Counting System For The Determination Of Creatine Phosphokinase, Steven E. Dueball

Masters Theses

No abstract provided.

Kinetic Studies Of Polymer-Bound Rhodium (I) Hydrogenation Catalyst, Nee-Yin Chou

Masters Theses & Specialist Projects

For many years, it has been customary to classify catalysts as homogeneous or heterogeneous. Generally, the former are more active and more selective. But the major disadvantage of the homogeneous catalysts is the need to separate the reaction products and to recover the catalyst, which is often somewhat more expensive than a "classical" heterogeneous catalyst. It has been considered, especially in the last ten years, that there might be advantages in chemically binding a homogeneous catalyst to a solid support.

Polymer-bound, anthranilic acid anchored rhodium (I) catalysts have been prepared. The rate of hydrogenation of cyclohexene has been studied quantitatively, …

Raman Scattering Study Of Cs2 In Cci4, Scott Whittenburg

Chemistry Faculty Publications

No abstract provided.

Kinematics And Thermodynamics Of Nickel(Ii)-Glycine Complexes Using Carbon Magnetic Resonance, Donald Frederick Shepard

Chemistry and Chemical Biology ETDs

l- ¹³C glycine was studied in nickel(II) solutions using carbon magnetic resonance (CMR). The carboxy bound nickel(II)-glycine complex and the kinetics of complexation between aquated nickel(II) ion and aquated glycine are described. It has been hypothesized that solutions containing no complexation higher than the chelated mono nickel(II)-glycine complex contain five magnetically different glycine species. The effects of these five magnetically different glycine species on the CMR spectra of the nickel(II)-glycine solutions are discussed.

Nonenzymatically Glucosylated Albumin: In Vitro Preparation And Isolation From Normal Human Serum, James F. Day, Suzanne R. Thorpe, John W. Baynes

Faculty Publications

Incubation of human serum with D-[6-3H]glucose resulted in the gradual accumulation of radioactivity in acid-precipitable material. Upon chromatography on Sephadex G-200, radioactivity was found associated with each of the major molecular weight classes of serum protein. Purified human serum albumin was also glucosylated in vitro upon exposure to D-[6-3H]glucose in phosphate-buffered saline. The glucosylated and unmodified albumins were separated by ion exchange chromatography. The physiological significance of these observations in vitro was confirmed by the isolation and quantitation of glucosylated albumin from normal human serum. Glucosylated albumin represents approximately 6 to 15% of total serum albumin in normal adults. The …

Depolarized Rayleigh Scattering Study Of Pyridine In Cyclohexane, Scott Whittenburg

Chemistry Faculty Publications

No abstract provided.

Lake Mead And Lake Powell Salinity Reports, Cathy Lee, Steve Gazafy

Publications (WR)

The enclosed reports were compiled for the Colorado River Water Quality Office based on salinity data for Lake Mead and Lake Powell. According to the regional director of the office, the reports are not considered "polished" documents for public distribution. However, he considers them to be "interesting, rough appraisals of general trends that may be very important In our understanding the hydro-salinity system in the Colorado River."

Metal Cluster Chemistry: Structure And Stereochemistry In The Polynuclear Rhodium Hydrides HNRhN[P(Or)3]2n, R. K. Brown, J. M. Williams, M. F. Fredrich, V. W. Day, A. J. Sivak, E. L. Muetterties

Chemistry Department: Faculty Publications

Crystallographic analyses of x-ray and neutron diffraction data have provided a definitive structural representation of {HRh[P(O-i-C₃H₇)₃]₂}₂ and [HRh[P(OCH₃)₃]₂}₃. These polynuclear hydrides are generated from square planar H2Rh[P(OR)₃]₂ units by edge (hydrogen atom) sharing and by vertex (hydrogen atom) sharing to form the dimeric and trimeric structures, respectively. The square-planar units are held together through four-center and three-center two-electron Rh-H-Rh bonds in the dimer and trimer, respectively. The dimer and trimer molecules each add one molecule of hydrogen to …

Protein Synthesis In Rabbit Reticulocytes: Mechanism Of Protein Synthesis Inhibition By Heme-Regulated Inhibitor, A. Das, O. Ralston, M. Grace, R. Roy, P. Ghosh-Dastidar, H. K. Das, B. Yaghmai, S. Palmieri, N. K. Gupta

Chemistry Department: Faculty Publications

Partially purified Met-tRNA_f binding factor, eIF-2, was phosphorylated by using heme-regulated inhibitor (HRI). Phosphorylated eIF-2 was freed from HRI by phosphocellulose column chromatography. Analysis by isoelectric focusing showed 100% phosphorylation of the 38,000-dalton subunit of eIF-2. Both eIF-2 and eIF-2(P) formed ternary complexes with Met-tRNA_f and GTP with almost the same efficiency, and in both cases the ternary complex formation was drastically inhibited by prior addition of Mg²⁺. However, whereas the ternary complexes formed with eIF-2 could be stimulated by Co-eIF-2C at 1 mM Mg²⁺ and dissociated by Co-eIF-2B at 5 mM Mg²⁺, …

Hidrometalurjide Yeni, Fathi Habashi

Fathi Habashi

Turkish translation of F. Habashi, “Recent Advances in Hydrometallurgy,” Proceedings International Mineral Processing Congress, Warsaw, 1979, edited by J. Laskowski, published by Elsevier, pp. 902–935