Kinetics and Mechanism of Oxidation of Leucine and Alanine by Ag(III) Complex in Alkaline Medium

Changying Song,Lei Chen,Jinhuan Shan

doi:10.1155/2008/786857

Abstract

Kinetics and mechanism of oxidation of leucine and alanine by Ag(III) complex were studied spectrophotometrically in alkaline medium at constant ion strength. The reaction was in first order with respect to Ag(III) complex and amino acids (leucine, alanine). The second-order rate constant, k−, decreased with the increasing in [OH−] and [IO4−]. A plausible mechanism was proposed from the kinetics study, and the rate equations derived from mechanism can explain all experimental phenomena. The activation parameters were calculated at 298.2 K.

Highlights

Transition metals in a higher oxidation state can be stabilized by chelation with suitable polydentate ligands, such as diperiodatargentate(III) [1,2,3,4], [ethylenebis(biguanide)silver(III)] [5, 6]
The kinetics and mechanism of oxidation of some amino acids have been studied by some researchers
In order to perfect the mechanism of oxidation of amino acids, the kinetics and mechanism of oxidation of alanine and leucine by [Ag(HIO6)2]5− have been studied in this paper

Summary

Introduction

Transition metals in a higher oxidation state can be stabilized by chelation with suitable polydentate ligands, such as diperiodatargentate(III) [1,2,3,4], [ethylenebis(biguanide)silver(III)] [5, 6]. These complexes were stable in a suitable aqueous solution. The kinetics and mechanism of oxidation of some amino acids have been studied by some researchers. In order to perfect the mechanism of oxidation of amino acids, the kinetics and mechanism of oxidation of alanine and leucine by [Ag(HIO6)2]5− have been studied in this paper

Experimental

Result and Discussion

Conclusion