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Kinetics and Mechanism of Ruthenium(III) Catalysed Oxidation of L-Arginine by Periodate in Alkaline Medium

Garapati Sridevi, Nowduri Annapurna, Parvataneni Vani


The kinetics of the ruthenium(III) catalysed oxidation of L-arginine by periodate was studied spectrophotometrically in alkaline medium at 280 nm and at a temperature 35 ± 0.1°C. It was found that the reaction is first order with respect to [catalyst] and [periodate]. The reaction showed fractional order dependence on [substrate] and [alkali]. The oxidation product of the reaction was found to be aldehyde. The anionic species of arginine (Arg) is considered to be the reactive species. A suitable mechanism involving complexation between Arg and [Ru(VIII)] was proposed leading to the rate law.

Keywords: oxidation of L-arginine, periodate, ruthenium (III)

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