Summary
The kinetics of formation and dissociation of the binuclear complex of CoII with histidinato(pentaammine)CoIII have been studied at 10.0°C⩽t°C⩽25°C and I = 0.3 mol dm−3 (ClO sup−inf4 ). The formation of the binuclear complex, [(NH3)5CoIIILCoII]4+ (L = histidinate), in the 5.7–6.8 pH range involves the reaction of Co(OH2) sup2+inf6 with the deprotonated, (NH3)5CoL2+, and monoprotonated, (NH3)5CoLH3+, forms of the complex. The rate and activation parameters for the formation are consistent with an I d mechanism. The binuclear species undergoes dissociation to yield the parent CoIII substrate and Co(OH2) sup2+inf6 via spontaneous and acid-catalysed paths. Comparison of spontaneous dissociation rate of the binuclear complex with other related systems indicated the chelate nature of the binuclear species.
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Das, N., Das, R. Complexation of cobalt(II) with histidinato(pentaammine)cobalt(III) in aqueous medium. A kinetic and mechanistic study. Transition Met Chem 21, 238–243 (1996). https://doi.org/10.1007/BF00165975
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DOI: https://doi.org/10.1007/BF00165975