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Chemistry Seminar

February 26, 2015
Smith Hall, Room 114, 11:00 a.m.

Mr. Steven Lauffer

Steric and Electronic Effects and Role of Water as a Base

Hydrogenases are reagents that catalyze the oxidation of molecular hydrogen in prokaryotic cells. Many hydrogenases have been made synthetically to work bidirectionally in the enzymatic process therefore both producing and consuming molecular hydrogen. The use of hydrogenase catalysts are the future of producing molecular hydrogen. In this study four derivatives of the hydrogenase, [Ni(PCy2NBn R2)2]2+(Cy = cyclohexyl, Bn = benzyl, R = OMe, COOMe, CO-alanine-methyl ester, CO-phenyl-alanine-methyl ester), were prepared and characterized with spectrometry as well as with electrochemistry. All four catalysts were found to be active for molecular hydrogen oxidation. This study provided a basis upon which larger proteins can be attached to the parent complex, [Ni (PCy2NBn2)2]2+, which will allow for further research concerning the effects of the outer coordination sphere on the oxidation of molecular hydrogen.

Miss Marcy Merritt

Constructing Covalent Organic Frameworks via Molecular Tectonics

Following the recent discovery of quintuple bonds, new applications and synthesisí are being studied. Reduction of chloro-bridged or quadruple bonded dichromium complexes with KC8 results in a quintuple bond. The bond is formed by 2 delta, 2 pi, and 1 sigma molecular orbitals. Bulky ligands are used to stabilize the multiple bond. Nineteen quintuply bonded complexes are currently under study for their reactivity. Applications of this compound include dimetal cleaving due to small molecule insertion, and synthesis of catalyst-free substituted aromatics and molecular squares.