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Journal of Chemistry
Volume 2013, Article ID 724505, 7 pages
http://dx.doi.org/10.1155/2013/724505
Research Article

Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar Media

1Department of Chemistry, Utkal University, Bhubaneswar 751004, India
2Department of Chemistry, Khallikote Autonomous College, Berhampur 760001, India

Received 30 June 2012; Accepted 15 September 2012

Academic Editor: Ioannis G. Roussis

Copyright © 2013 M. Sanjana et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The kinetics and mechanism of the electron transfer of DL-Aspartic acid (Asp) by Mn (VII) in alkaline medium has been studied spectrophotometrically over the range [Asp]  mol dm−3;  mol dm−3;  K and  mol dm−3 (KNO3). The reaction exhibits first-order dependence in but shows fractional-order dependence in both and . The reaction was studied in the presence of sodium dodecyl sulfate (SDS); an increase in the rate with the increase in the micellar concentration was observed. The products were characterized by spectral analysis. A mechanism involving free radicals is proposed. Asp binds to form a complex that subsequently decomposes to products. Activation parameters ° (kJ mol−1) and ° (JK−1 mol−1) for the reaction are and , respectively. The negative value of ° indicates that oxidation occurs via inner sphere mechanism.