David Clevette

Chemistry - Professor
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Post-Doctoral Fellowship, University of British Columbia, Vancouver , 1987-1989.

Ph.D., Inorganic Chemistry, University of Missouri-Columbia, 1987.

Research Interests:

I. Physical Properties of Potential Pharmaceuticals

We are working with a pharmaceutical research company to determine physical properties of some of their new drug substances - synthetic antibiotics of a novel cephalosporin class of beta-lactams. All of the compounds studied have various acidic functional groups, and the acidity constants (pKa values) are determined through potentiometric titrations.  Another study includes using proton nmr to measure the proton shifts as a function of pD.  That enables an assignment of pKa values to the specific functional groups on the molecule.  Degradation kinetic studies of these compounds may also be studied using UV-VIS spectroscopy and HPLC.

II.  Metal Ion - Ligand Complex Formation

Potentiometry may be used to study the competition between protons and metal ions for a ligand in  aqueous solution.  This leads to a measurement of formation constants of metal-ligand complexes.  Amino acids and EDTA are a couple of examples of ligands that can complex a metal ion.  The use of ion chromatography is also planned to help study these systems.

III. Metal Leaching of Ceramic Glazes

The use of AA spectroscopy can be used to determine the small concentration of metal ions that may leach into solution when in contact with pottery glazes under various conditions.  Variables such as time, surface area of contact, temperature, pH, and the presence of complexing agents will be investigated.  Pottery glazes will be donated from the Doane University art department.

IV.  Making Bronze the Old-Fashioned Way

Ever wondered how bronze was first made? The ancient methods of making bronze will be investigated and reproduced.

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