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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 P-31 NMR spectroscopy. Upon interaction of diselenides with (Me3P)(2)AuBr or with (Et3P)(2)AuBr, 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)(2)AuBr. Selenocystamine reacts with (Et3P)(2)AuBr about 100 times faster than its corresponding disulfide. However, cystamine reacts twice as fast with (Me3P)(2)AuBr compared to its corresponding diselenide., |
