Electrolytically generated manganese(III) sulfate for the oxidation of L-histidine in aqueous sulfuric acid: A kinetic study.

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概要

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• Conditions have been established for the electrogeneration of Mn(III) from Mn(II) in sulfuric acid medium. Mn(III) formed was identified and characterized by UV spectra. Kinetics of Mn(III) oxidation of L-histidine in aqueous sulfuric acid medium has been studied spectrophotometrically. Oxidation followed second order kinetics in [Mn(III)], first order in [histidine] and increase in [H<SUP>+</SUP>] decreased the rate. The reduced product of the oxidant, Mn(II), retarded the rate of reaction. Evidence for the transient existence of the free radical reaction intermediate is given. Effects of ionic strength, solvent composition, HSO<SUB>4</SUB><SUP>−</SUP> and certain complexing agents like P<SUB>2</SUB>O<SUB>7</SUB><SUP>4−</SUP>, Cl<SUP>−</SUP>, F<SUP>−</SUP>, have also been studied. Added complexing agents decreased the redox potential of the Mn(III)/Mn(II) couple, thereby reducing the oxidation rate. Dependence of reaction rate on temperature is examined and activation parameters computed from Arrhenius and Eyring plots. A mechanism consistent with kinetic results has been proposed in which a combined role of Mn(III)aq and MnOH<SUP>2+</SUP>aq was envisaged.

• 公益社団法人 日本化学会の論文

著者

• Sherigara B.

  Department Of Post-graduate Studies And Research In Chemistry Mangalore University

• Pinto Ivan

  Department of Post-Graduate Studies and Research in Chemistry, Mangalore University

• Udupa H.

  Chemical Engineering Department, Manipal Institute of Technology

関連論文

• Oxidation of a Dipeptide by Electrolytically Generated Manganese(III) in Aqueous Sulfuric Acid Medium : A Kinetic and Mechanistic Study
• Electrolytically generated manganese(III) sulfate for the oxidation of L-histidine in aqueous sulfuric acid: A kinetic study.

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