• Cyclic voltammetric studies of dioxygenbridged dinuclear cobalt(III) complexes

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      https://www.ias.ac.in/article/fulltext/jcsc/097/03-04/0417-0448

    • Keywords

       

      Cyclic voltammetric studies; dioxygen-bridged dinuclear Co(III) complexes; superoxo complexes; peroxo complexes; coordinated dioxygen systems

    • Abstract

       

      Cyclic voltammetric studies were carried out for dioxygen-bridged dinuclear cobalt(III) complexes using platinum electrodes at different values of pH and ionic strength. Reversible electrode reactions occur particularly for the dioxygen complexes [(phen)2Co(μ-O2,NH2)Co(phen)2] (ClO4)42H2O and [(bpy)2Co(μ-u-O2, NH2)Co(bpy)2] (ClO4)4H2O with 1,10-phenanthroline (phen) and 2,2-bipyridine (bpy) as the non-bridging ligands. For complexes with ammonia (NH3) ethylenediamine (en) as the terminal ligands, there is quasi-reversible electrode behaviour at pH < 3 due to protonation of the peroxo complexes which subsequently undergo equilibration with isomeric forms. Such behaviour is well-marked for the peroxo complex [(en)2Co(μ-O2 NH2)Co(en)2](NO3)3. The decaammine complex [(NH35Co(μ-O2Co(NH3)5](NO3)5 shows only a cathodic peak due to intramolecular charge transfer decomposition in solution after reduction at the electrode. Diffusion coefficients for all the dioxygen complexes were determined from the plots ofIp vs.v1/2.

    • Author Affiliations

       

      S Ilangovan1 P Natarajan1

      1. Department of Inorganic Chemistry, School of Chemistry, University of Madras, Guindy Campus, Madras - 600025, India
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  • Journal of Chemical Sciences | News

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