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Manganese(III) oxidation of L-serine in aqueous sulfuric acid medium: Kinetics and mechanism

✍ Scribed by S. Chandraju; K. S. Rangappa; N. M. Made Gowda

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 138 KB
Volume: 31
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1999)31:8<525::aid-kin1>3.0.co;2-c

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✦ Synopsis

Kinetics and mechanism of oxidation of L-serine by manganese(III) ions have been studied in aqueous sulfuric acid medium at Manganese(III) sulfate was prepared by an 323 K. electrolytic oxidation of manganous sulfate in aqueous sulfuric acid. The dependencies of the reaction rate are: an unusual one and a half-order on [Mn(III)], first-order on [ser], an inverse first-order on and an inverse fractional-order on [Mn(II)]. Effects of complexing agents ϩ

[H ], and varying solvent composition were studied. Solvent isotope studies in D 2 O medium were made. The dependence of the reaction rate on temperature was studied and activation parameters were computed from Arrhenius-Eyring plots. A mechanism consistent with the observed kinetic data has been proposed and discussed.

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