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Filtering by: Creator Kropp, Bradley Ray Remove constraint Creator: Kropp, Bradley Ray Academic Affiliation Chemistry Remove constraint Academic Affiliation: Chemistry

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  • A Diels-Alder approach to biaryl synthesis

    Creator:
    Ashburn, Bradley O.
    Abstract:
    An expedient approach to the synthesis of a wide range of highly programmable biaryl templates has been accomplished. Utilizing the Diels-Alder [4+2] cycloaddition, a wide range of tri- and tetra-ortho-substituted biaryls have been synthesized in only three to four steps from commercially available materials. We have successfully synthesized entire classes...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT FOR THE DISSERTATION OF Bradley O. Ashburn for the degree of Doctor of Philosophy

  • Highly Regioselective Nitrile Oxide Dipolar Cycloadditions with ortho-Nitrophenyl Alkynes

    Creator:
    McIntosh, Melissa L., Naffziger, Michael R., Ashburn, Bradley O., Zakharov, Lev N., and Carter, Rich G.
    Abstract:
    The dipolar cylcoadditions of ortho-nitrophenyl alkynes with aryl nitrile oxides has been demonstrated. A range of substituents are tolerated on the alkyne. These reactions proceed with excellent levels of regioselectivity. Subsequent functionalization of the isoxazole scaffold has been demonstrated.
    Resource Type:
    Article
    Full Text:
    Michael R. Naffziger, a Bradley O. Ashburn, a Lev N. Zakharov b and Rich G. Carter* a Received

  • The normal vibrational analysis of polyacetaldehyde

    Creator:
    Lee, Dorothy
    Abstract:
    A method of calculating the normal vibrations of polymer molecules is presented in detail. The method is based on that used by Schachtschneider and Snyder in their analysis of polypropylene but has not heretofore been published. The factoring of the infinite matrix and reduction to the coordinates of the unit...
    Resource Type:
    Dissertation
    Full Text:
    error inherent in using the equili- briurn transformation between the valence and Urey-Bradley force

  • Swelling of alkylammonium, montmorillonites

    Creator:
    Hiltner, Phyllis Anne, 1941-
    Abstract:
    Adsorption on a series of primary n-alkylammonium bentonites was studied by simultaneous gravimetric determination of the adsorption isotherm and X-ray diffraction measurement of the c-spacing. All adsorbates gave typical Type II isotherms. BET plots were linear in the region P/P[subscript o] = 0.10 - 0.35 and v[subscript m] values were...
    Resource Type:
    Dissertation
    Full Text:
    bentonites was studied by simultaneous gravimetric determination of the ad- sorption isotherm and X -ray

  • Synthesis and study of transparent p- and n-type semiconductors and luminescent materials

    Creator:
    Park, Cheol-Hee
    Abstract:
    New transparent p- and n-type semiconductors and luminescent materials have been prepared and characterized. Synthesis, structures, optical and electrical properties of new chalcogenide fluoride p-type transparent semiconductors MCuQF (M=Ba, Sr; Q=S, Se, Te) are described. Band-gap tuning and improvement in conductivity through p-type doping are demonstrated in the family. The...
    Resource Type:
    Dissertation
    Full Text:
    properties of new potential X-ray phosphors Lu2O2S:Ln3 (Ln=Eu, Tb) are summarized. ©Copyright by Cheol

  • Solvent selectivity of several organoclay complexes

    Creator:
    Nee, Mary
    Abstract:
    Six organoclay complexes have been studied in terms of their selective adsorption from binary solutions of methanol and toluene. Analyses are based on differential refractometry methods. The isotherms were of the usual "S" type. The crossover points reveal trends in the organophilic nature of the interlaminar surfaces in these clay...
    Resource Type:
    Masters Thesis
    Full Text:
    -ray diffraction methods to analyse clay materials. They found crystalline materials in the finest

  • Heats of immersion and swelling of quaternary ammonium complexes of montmorillonites

    Creator:
    St. Clair, Akos Dominic
    Abstract:
    Heats of immersion were obtained for four different organophilic clay complexes in a series of normal alcohol-heptane mixtures with alcohols of increasing chain length. The immersion calorimeter employed was the Dewar type with a sensitivity of approximately 5 x 10⁻⁵°C. Gel volumes were determined for two of the clay complexes...
    Resource Type:
    Masters Thesis
    Full Text:
    part of this work, and to Miss P. A. Hiltner for the X -ray analysis of the organo- clays. TABLE

  • Exploring the Iron Keggin Ion as a Prenucleation Cluster for Iron Oxide Nanoparticles Formation

    Creator:
    Sadeghihosseinabadi, Omid
    Abstract:
    Iron oxide materials including ferrihydrite and magnetite play essential roles in contaminant transport, pH control of surface and groundwater, and microbial activity. They have various applications ranging from data storage to cancer therapy. Recent studies showed that the NPs growth does not involve atom by atom nucleation but starts by...
    Resource Type:
    Dissertation
    Full Text:
    manuscript writing. L.N.Z. performed single crystal X-Ray diffraction. In Chapter 3, all authors

  • Stable activable tracers for environmentally significant organic molecules

    Creator:
    Ghannam, Lina M.
    Abstract:
    The need for field and laboratory studies of the physical and chemical behavior of environmentally significant organic molecules often poses problems because of the toxicity of the chemical and the difficulty of detecting it at environmentally significant concentrations. Two dysprosium tracers, dysprosium (III) trisacetylacetonate trihydrate and dysprosium(III) trisdibenzoylmethane monohydrate, were...
    Resource Type:
    Masters Thesis
    Full Text:
    Production, y Ray Irradiation 21 VII. Stability of Dy(dbm)3120 at 25°C in Sea Water at 100/00 in Acetone

  • Solid state luminescent materials : new and improved

    Creator:
    VandenBerghe, Kenneth L.
    Resource Type:
    Masters Thesis
    Full Text:
    television, computer monitors, oscilloscopes, fluorescent lights, photocopy machines, suntan lamps, X-ray