Abstract
The kinetics of oxidation of L-Cysteine in aqueous HClO4 medium were studied using a one-equivalent oxidant, hexachloroiridate(IV). The reaction exhibits second-order dependence with respect to hexachloroiridate(IV) and first-order in cysteine. The rate decreases with increase in hydrogen ion concentration indicating that the zwitterionic form of cysteine is more reactive. Cysteic acid is identified as the product of oxidation. A suitable mechanism involving the formation of [IrCl6]2− – sulphur bonded intermediate is proposed. The activation parameters of the reaction are computed using the linear least squares method and the values of Ea and ΔS# are found to be 27.97±1.82 kJ mol−1 and −51.30±6.0 J K−1mol−1, respectively.
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