Abstract
Redox reactions of bis (trialkylphosphine) gold(I) bromide (alkyl = methyl, ethyl) with two diselenides (R′Se–SeR′), selenocystine and selenocystamine and their corresponding disulfides were studied in D2O by 31P NMR spectroscopy. Upon interaction of diselenides with (Me3P)2AuBr or with (Et3P)2AuBr, the Se–Se bond is broken, resulting in the formation of R3PAu+, R′SeH, R′Se–Au–PR3, R3PO and (AuSeR′) n . Second-order rate constants were determined for the decomposition of (R3P)2AuBr. Selenocystamine reacts with (Et3P)2AuBr about 100 times faster than its corresponding disulfide. However, cystamine reacts twice as fast with (Me3P)2AuBr compared to its corresponding diselenide.
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