Spectroscopic and catalytic properties of penicillamine-molybdenum complexes.

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Abstract
A new blue colored penicillamine-Mo complex was obtained at pH 9.2 under a reduction with sodium borohydride. This complex gave ESR signal which had a high level of a monomeric Mo, and showed absorption maxima at 440 and 630 nm which could be assigned to d-d [electron orbital] transitions arising from a 4A2g ground state. By an aeration, the Mo complex was oxidized to the yellow colored dioxo-bridged Mov complex. The catalytic activity of the penicillamine-Mo complexes was investigated by the reduction of acetylene to ethylene and ethane in the presence of borohydride. A special interest has been shown in chemical model systems which involve essential nitrogenase-system components, such as thiol compounds, molybdate, ATP and Fe. Especially, Mov complexes of cysteine, 1-thioglycerol and glutathione have been reported to be an interesting and functional model for N2-ase.

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