• Mechanistic study of ruthenium (III) catalysed oxidation of L-lysine by diperiodatoargentate (III) in aqueous alkaline medium

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    • Keywords

       

      Kinetics of oxidation; L-lysine- Ru(III) catalysis; diperiodatoargentate(III).

    • Abstract

       

      The kinetics of Ru(III) catalysed oxidation of L-lysine by diperiodatoargentate (III) (DPA) in alkaline medium at 298 K and a constant ionic strength of 0.50 mol dm-3 was studied spectrophotometrically. The oxidation products are aldehyde (5-aminopentanal) and Ag (I). The stoichiometry is i.e. [L-lysine] : [DPA] = 1 : 1. The reaction is of first order in [Ru(III)] and [DPA] and is less than unit order in both [L-lys] and [alkali]. Addition of periodate had a retarding effect on the reaction. The oxidation reaction in alkaline medium has been shown to proceed via a Ru(III)-L-lysine complex, which further reacts with one molecule of monoperiodatoargentate(III) (MPA) in a rate determining step followed by other fast steps to give the products. The main products were identified by spot test, IR, GC-MS studies. The activation parameters with respect to slow step of the mechanism are computed and discussed and thermodynamic quantities are also determined. The active species of catalyst and oxidant have been identified.

    • Author Affiliations

       

      R R Hosamani1 S T Nandibewoor1

      1. PG Department of Studies in Chemistry, Karnatak University, Dharwad 580 003
    • Dates

       
  • Journal of Chemical Sciences | News

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