• Kinetics of the reversible uptake of carbon dioxide and sulphur dioxide by thecis-(hydroxo) (imidazole)bis(ethylenediamine) cobalt(III) ion in aqueous medium. A comparative study

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    • Keywords


      Kinetics; cis-(hydroxo)(imidazole)bis(ethylenediamine)cobalt(III); sulphur dioxide; carbon dioxide

    • Abstract


      The addition of SO2 tocis-(hydroxo) (imidazole)bis(ethylenediamine) cobalt(III) ion-generated-oxygen-bonded sulphito complex, the kinetics of which have been studied by the stopped-flow technique. The rate and activation parameters for the formation ofcis-[(en)2(imH)CoOSO2]+, the elimination of SO2 from this O-bonded sulphito species which is H+-catalysed and of second order, and formation of the corresponding carbonato complexcis-[(en)2(imH)CoOCO2]+, by the reaction of CO2 withcis-[(en)2(imH)CoOH] have been determined. The bicarbonato complex,cis][(en)2(imH)CoCO2H]2+, undergoes spontaneous CO2 elimination. The relatively low ΔH and large negative values of ΔS for CO2 uptake bycis-[(en)2(imH)CoOH]2+ are in contrast to the values for other analogous complexes of cobalt(III) reported in the literature. Some specific effects of cobalt(III)-bound imidazole on CO2-addition processes have been inferred.

    • Author Affiliations


      A N Acharya1 A C Dash1

      1. Department of Chemistry, Utkal University, Bhubaneswar - 751004, India
    • Dates

  • Journal of Chemical Sciences | News

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