Search Constraints

Start Over
Filtering by: Creator Hammers, Lewis Angle Remove constraint Creator: Hammers, Lewis Angle Academic Affiliation Chemistry Remove constraint Academic Affiliation: Chemistry

Search Results

  • Chemical and physical influences of the atmosphere upon the spatial and temporal characteristics of atomic fluorescence in laser microprobe plumes

    Creator:
    Lewis, Arnold Leroy
    Abstract:
    The temporal and spatial characteristics of the plume produced by a laser microprobe, are dependent upon the composition and pressure of the atmosphere surrounding it. It has been shown that certain atmospheres can enhance the analytical signal by increasing the free atom lifetime. Improvements were made to the existing laser...
    Resource Type:
    Dissertation
    Full Text:
    ABSTRACT OF THE THESIS OF Arnold Leroy Lewis II for the degree of Doctor of Philosophy in Chemistry

  • Proton-neutron-hole states in antimony isotopes populated in the beta decay of ¹²⁸SN and ¹³⁰SN

    Creator:
    Nunnelley, Lewis Lee
    Abstract:
    ¹³⁰ Sn and ¹²⁸Sn were separated from mixed fission products. The decay of these isotopes were studied with Ge(Li), LEPS, and plastic scintillator detector systems in single and two parameter coincidence modes. The decay scheme constructed for ¹²⁸Sn decay has levels at 0.0 (5+), 45.7 (4+), 77.8 (3+), 152.9 (2+),...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE THESIS OF LEWIS LEE NUNNELLEY for

  • An investigation of the crystal growth of the heavy metal sulfides in supercritical hydrogen sulfide

    Creator:
    Lewis, Leroy Crawford
    Abstract:
    Solubility studies on the heavy metal sulfides in liquid hydrogen sulfide at room temperature were carried out using the isopiestic method. The results were compared with earlier work and with a theoretical result based on Raoult's Law. A relative order for the solubilities of sulfur and the sulfides of tin,...
    Resource Type:
    Dissertation
    Full Text:
    in supercritical hydrogen sulfide AN ABSTRACT OF THE THESIS OF LEROY CRAWFORD LEWIS for the

  • Preparation and Lewis acid properties of diboron tetrafluoride and related compounds

    Creator:
    Hansen, John Donald
    Abstract:
    Attempts to synthesize diboron tetrafluoride by the reduction of boron trifluoride with alkali metal solutions in 1, 2-dimethoxyethane proved to be unsuccessful. No diboron tetrahalide was found when boron trifluoride, antimony trifluoride, or boron trichloride was reacted with tetra-(dimethylamino)-diboron; although there appeared to be some exchange between chloride and amine...
    Resource Type:
    Dissertation
    Full Text:
    Preparation and Lewis acid properties of diboron

  • Low temperature thermal analysis of some boron halide complexes with weak Lewis bases

    Creator:
    Lerch, Ronald Edwin
    Abstract:
    Thermal analysis was used to investigate the following seven systems: H₂S-B₂F₄, SOF₂-B₂F₄, COC1₂-B₂F₄, SF₄-B₂F₄, Xe-BF₃, NF₃-BF₃, and NF₃-BC1₃. In two of the seven systems compound formation was observed. In the system, H₂S-B₂F₄ the compounds H₂S[superscript .]B₂F₄ and 2H₂S[superscript .]B₂F₄ are formed. The compound H₂S[superscript .]B₂F₄ has a melting point of...
    Resource Type:
    Dissertation
    Full Text:
    complexes with weak Lewis bases AN ABSTRACT OF THE THESIS OF RONALD EDWIN LERCH for the Ph. D. in

  • Computational Rationalizations of Mechanism and Stereocontrol in Small-Molecule Lewis Base Organocatalysis

    Creator:
    McCauley-Walden, Daniel W.
    Abstract:
    My work has focused on investigating synthetic organic reactions using applied computational methods. Non-covalent interactions are critical to catalysis, mechanism, and stereoselectivity, with the most prominent interaction for isothioureas being the S···O contact between the catalyst sulfur atom and the oxygen of the acyl group. A comprehensive joint experimental and...
    Resource Type:
    Dissertation
    Full Text:
    Stereocontrol in Small-Molecule Lewis Base Organocatalysis. Abstract approved: Paul Ha-Yeon

  • Synthesis, characterization, and reactivity of rhenium dithiodiolate and monothiodiolate complexes

    Creator:
    Chuawong, Pitak
    Abstract:
    The rhenium dithiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazol yl) borato(ethane- 1 ,2-dithiodiolato)(oxo)rheni um(V), and Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazolyl)borato(phenylethanedithiodiolato)(oxo)rhenium(V), were synthesized by reductive cyclocondensation of alkane-1,2-dithiols with Tp'Re0₃ in a one pot fashion. The rhemium monothiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazolyl) borato(ethane- 1 ,2-monothiodiolato)(oxo)rhenium(V), and Hydrido-tris-(3 ,5- dimethyl- 1 -pyrazolyl)borato(propanemonothiodiolato)(oxo)rhenium(V), were also synthesized...
    Resource Type:
    Masters Thesis
    Full Text:
    , and an unusually small dihedral angle (S-C-C-S) of about 12° was observed. The solution conformation

  • Studies on nitrogen containing secondary metabolites from terrestrial and marine origin

    Creator:
    Barrios Sosa, Ana Carolina
    Abstract:
    PART I. A deuterium exchange analysis of 2,5-dihydroxyacetanilide (5) in the absence and presence of DHAE II was performed to test the nucleophilicity of the substrate in the absence and presence of catalyst. In addition, inhibition studies using 1,4-dihydroxybenzene were performed to determine the role that the N-acetyl side chain...
    Resource Type:
    Dissertation
    Full Text:
    palladium couplings, Redacted for privacy organocuprates, Lewis acid catalysts, and aza-Claisen

  • Isolation of New Niobium clusters with Alkali Carbonate

    Creator:
    Feng, Ching-Lei
    Abstract:
    Polyoxoniobates (PONbs) are attracting great attention in recent years due to its novelty as well as a variety of geometrical presentations in different pH conditions. In this paper we are reporting the reaction of tetramethyl-decaniobate ([(CH3)4N]6[Nb10O28]) with alkaline carbonates to observe the periodic trend of alkaline ions interacting with the...
    Resource Type:
    Capstone Project
    Full Text:
    cluster, using solution characterization including Small Angle X-ray Scattering (SAXS) and Raman

  • Structural effects of intrinsic and extrinsic perturbations to model membranes

    Creator:
    Church, Sara E.
    Abstract:
    The observed and calculated structural parameters of three systems of phosphatidylcholine bilayers in fully-hydrated multilamellar vesicles (MLVs) were determined using x-ray diffraction techniques. The analysis used the x-ray reflections from the low-, intermediateand wide-angle regions of the diffraction patterns in the subgel, gel, rippled and fluid phases to determine the...
    Resource Type:
    Dissertation
    Full Text:
    reflections from the low-, intermediate- and wide-angle regions of the diffraction patterns in the subgel