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Darrell P. Eyman |
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Associate Professor |
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Office: 361
CB email: darrell-eyman@uiowa.edu |
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Biosketch:
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| Recent Publications | |
Research Interests
Current research efforts involving studies of organometallic complexes of transition metals are designed to model reactive sites of small molecules on the surface of heterogeneous catalysts. In addition to offering structure and reactivity characterization, these studies furnish mechanistic information which is of value in catalyst design. We are interested in soluble transition metal carbonyl derivatives which have potential for activating carbon monoxide, carbon dioxide, halocarbons, and other relatively inert small molecules including hydrocarbons. Several studies currently in progress involve synthesis, characterization, and reactivity studies of derivatives of (η5-C6(CH3)6-nHn)Mn(CO)3 (M = Mn and Re). Studies of endo-(η5-C6(CH3)6H)Mn(CO)L2 (L = CO or PR3) have revealed interesting reactivity patterns with various electrophiles, involving transfer of the exo-hydrogen as a hydride ion. The radical chain hydrodehalogenation reaction of these species with aliphatic halocarbons is also under investigation. Deprotonation of (η6-C6(CH3)6)Mn(CO)3 produces (η5-C6(CH3)5(=CH2)Mn(CO)3 which displays interesting reaction pathways at the exocyclic methylene. The formation and reactivities of ligand substituted derivatives of this complex are under investigation.
A second area of research involves heterogeneous catalysis of the reactions of small molecules. A major focus in this work is development of new oxide support materials for use in a range of reaction types. The reactants, most often introduced in the gaseous state, diffuse through the porous support on which various active catalysts, including precious metals, are deposited. Ê Products diffuse out of the porous support and are collected and/or analyzed as they exit the reactor. The reactions of interest, of industrial or environmental significance, include hydrogenations, hydrocarbon and alcohol dehydrogenations, and hydrodehalogenations.
ORTEP drawing of endo-(η5-C6(CH3)6H)Mn(CO)(P(OCH3)3)2
