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E-Journal of Chemistry
Volume 5 (2008), Issue 1, Pages 43-51

Kinetics of Oxidation of Cobalt(III) Complexes of a Acids by Hydrogen Peroxide in the Presence of Surfactants

Mansur Ahmed and K. Subramani

Department of Chemistry, Islamiah College, Vaniyambadi-2, India

Received 5 April 2007; Accepted 20 July 2007

Copyright © 2008 Hindawi Publishing Corporation. 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.


Hydrogen peroxide oxidation of pentaamminecobalt(III) complexes of α-hydroxy acids at 35°C in micellar medium has been attempted. In this reaction the rate of oxidation shows first order kinetics each in [cobalt(III)] and [H2O2]. Hydrogen peroxide induced electron transfer in [(NH3)5 CoIII-L]2+ complexes of α-hydroxy acids readily yields 100% of cobalt(II) with nearly 100% of C-C bond cleavage products suggesting that it behaves mainly as one equivalent oxidant in micellar medium. With unbound ligand also it behaves only as C-C cleavage agent rather than C-H cleavage agent. With increasing micellar concentration an increase in the rate is observed.