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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/125/05/1123-1132

    • Keywords

       

      Nickel(III) cyclam; hydrogen peroxide oxidation; Cu(II) catalyst.

    • Abstract

       

      The kinetics of oxidation of H2O2 by [NiIII(cyclam)]3+, [NiIIIL1], was studied in aqueous acidic media at 25°C and I = 0.5M (NaClO4). The [NiIIIL1] to [NiIIL1] reduction was found to be fast in the presence of Cu(II) ion than the oxidation of the cyclam ligand by ·OH. The rate constant showed an inverse acid dependence on H+ ion at the pH range 1-1.5. The presence of sulphate retards the reaction. Macrocylic ligand oxidation was followed spectrophotometrically by examining the oxidation of nickel(II) complexes of macrocyclic ligands such as 1,8-bis(2-hydroxyethyl)-1,3,6,8,10,13-hexaazacyclotetradecane (L2), 𝑚𝑠-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (L3), rac-Me6[14]-4,11-dieneN4 (L4) by reaction with hydrogen peroxide. The rate constant for the cross reaction is discussed in terms of Marcus relationship.

    • Author Affiliations

       

      Sankaran Anuradha1 Venkatapuram Ramanujam Vijayaraghavan1

      1. Department of Physical Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India

    • Dates

       
      Published
      September 2013
      Manuscript received
      29 August 2012
      Manuscript revised
      9 February 2013
      Accepted
      8 March 2013

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