Reduction of [CP*2Mo2O5] by mercaptopropionic acid in an aqueous medium.: Isolation and characterization of a dinuclear oxo- and 3-sulfido-proprionato(2-)-bridged molybdenum(IV) compound
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Abstract
Reaction of Cp-2*Mo2O5 with HSCH2CH2COOH in acidic (by CF3COOH) 50:50 MeOH-H2O solvent at room temperature yields compound Cp-2*Mo-2(mu-O)(mu-SCH2CH2CO2)(2), a dinuclear diamagnetic Mo-IV compound with a two-leg-sharing bis(four-legged piano stool) structure and a Mo-Mo distance of 2.6833(6) angstrom. A reaction monitoring by ESI MS shows the formation of an intermediate 18 mass units heavier, interpreted as a dihydroxo analogue. Electrochemistry shows a reversible, pH independent oxidation process and an irreversible, pH-dependent reduction process. Contrary to a recently published analogous reaction with the closely related HSCH2COOH substrate, this process does not lead to C-S bond cleavage. (c) 2007 Elsevier B.V. All rights reserved.