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• W2064234517 abstract "In weakly acidic media ([H(+)], 0.01-0.06 M), 2-mercaptoethanol (mercap, RSH), thioglycolic acid (tga, R'SH) and L-cysteine (cys, R''SH) reduce the superoxo ligand of the complex ion, {mu-amido-mu-superoxo-bis[tetraamminecobalt(III)]}(4+) (1) to its corresponding hydroperoxo complex, {mu-amido-mu-hydroperoxo-bis[tetraamminecobalt(III)]}(3+) (2). During this act, RSH and R'SH are quantitatively oxidized to their respective disulfides. However, cysteine (R''SH) is converted to a mixture of approximately 80% of the disulfide, cystine and approximately 20% to cystine sulfinic acid. Cystine itself is not a source of the sulfinic acid. Dissolved copper, even at the impurity level, dramatically catalyzes the reaction such that the direct reactions are inaccessible. Nevertheless, the catalyzed path can be masked completely with 0.20 mM dipicolinic acid and it can be determined for the first time that, the direct reactions are first-order in [1], in [total thiol] and in basicity. Rate decreases linearly with increasing mol% of D(2)O in the solvent. H-atom (H(+) + e) transfer from thiols to superoxide in 1 seems logical for the conversion of 1 to 2." @default.
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• W2064234517 date "2010-01-01" @default.
• W2064234517 modified "2023-09-24" @default.
• W2064234517 title "Reduction mechanism of a coordinated superoxide by thiols in acidic media" @default.
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• W2064234517 doi "https://doi.org/10.1039/b918582h" @default.
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