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  • Chem Sci Trans., 2015, 4(2),  pp 552-558  

    DOI:10.7598/cst2015.1030

    Research Article

    Mechanism of Osmium(VIII) Catalysed Oxidation of L-Arginine by Periodate in Alkaline Medium - A Kinetic Study

  • G. SRIDEVI1, N. ANNAPURNA2 and P. VANI3*
  • 1,3Department of Inorganic and Analytical Chemistry, Andhra University, Visakhapatnam-530 003, A.P, India
    2Department of Engineering Chemistry, AUCE(A), Andhra University, Visakhapatnam-530 003, A.P, India
  • Abstract

    The kinetics of the osmium(VIII) catalyzed oxidation of L-arginine by periodate has been studied spectrophotometrically in alkaline medium at 280 nm. The reaction is first order with respect to [catalyst]. The reaction showed second order dependence on [periodate], fractional order dependence on [alkali] and is independent of substrate. The oxidation product of the reaction was found to be α- keto acid. A plausible mechanism has been proposed. The energy of activation, Ea and entropy of activation, ΔS# were computed and are found to be 53.00 ±1.78 kJ mol-1 and -46.30 ± 5.34 JK-1mol-1 respectively.

    Keywords

    Oxidation of L-arginine, Periodate, Osmium(VIII)

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