Manganese(III) Oxidation of L-Methionine in Aqueous Acetic Acid Medium: A Kinetic and Mechanistic Study

被引：6

作者：

Chidankumar, C. S. ^{[2
]}

Chandraju, S. ^{[3
]}

Gowda, Netkal M. Made ^{[1
]}

机构：

[1] Western Illinois Univ, Dept Chem, Macomb, IL 61455 USA

[2] Bharathi Coll, Dept Chem, Mandya, Karnataka, India

[3] Univ Mysore, Sir M Visweswaraya Post Grad Ctr, Dept Studies Sugar Technol, Mandya, Karnataka, India

来源：

SYNTHESIS AND REACTIVITY IN INORGANIC METAL-ORGANIC AND NANO-METAL CHEMISTRY | 2009年 / 39卷 / 10期

关键词：

kinetics; manganese(III); mechanism; methionine; oxidation; reduction; ANODICALLY-GENERATED MANGANESE(III); SULFURIC-ACID; PYROPHOSPHATE; ACETATE; THREONINE; CHEMISTRY; SULFATE; SERINE;

D O I：

10.1080/15533170903433147

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A solution of manganese(III) acetate in aqueous acetic acid medium has been prepared by a standard electrochemical method. The nature of the oxidizing species present in manganese(III) solution has been characterized by spectrophotometric and redox potential measurements. Kinetics of oxidation of L-methionine (Met) by manganese(III) in aqueous acetic acid (60%v/v) at 323 K has been studied. The experimental rate law obtained is: rate = [Mn(III)]x [Met]y [OAc-]z /[H+]n, where x, y, z and n represent fractional orders. Effects of varying ionic strength, solvent composition, and added ions such as fluoride, chloride, and perchlorate have been investigated. Activation parameters have been evaluated using Arrhenius and Eyring plots. A mechanism consistent with the observed kinetic data has been proposed and discussed. A rate law has been derived based on the mechanism.

引用

页码：645 / 650

页数：6

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