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Kinetics and mechanism of the reversible formation of the binuclear species between pyridine-2-carboxylato (pentaammine) cobalt(III) and cobalt(II) in aqueous solution

  • Inorganic and Analytical
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Abstract

The kinetics of formation and dissociation of the binuclear complex of cobalt(II) with pyridine-2-carboxylato(pentaammine) cobalt(III) have been studied in the temperature range 10–25°C and atI=0·3 mol dm−3 (ClO −4 . The formation of (NH3)5CoO2CC5H4NCo4+ in thepH range 2·35–3·20 involves the reaction of Co(OH2) 2+6 with the protonated (pyridine-N) and the deprotonated forms of the complex. The rate and activation parameters for the formation reaction are consistent with anI d mechanism. The binuclear species undergoes dissociation to yield the parent cobalt(III) substrate and cobalt(II) via spontaneous and acid-catalysed paths. The rate data at 20°C for the spontaneous dissociation of the binuclear complex and of mono(pyridine-2-carboxylato) cobalt(II) are comparable indicating the chelating nature of the binuclear species.

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  1. Regional Research Laboratory, 751 013, Bhubaneswar, India

    Nigamananda Das

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  1. Nigamananda Das
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Das, N. Kinetics and mechanism of the reversible formation of the binuclear species between pyridine-2-carboxylato (pentaammine) cobalt(III) and cobalt(II) in aqueous solution. Proc. Indian Acad. Sci. (Chem. Sci.) 105, 245–252 (1993). https://doi.org/10.1007/BF02866913

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  • DOI: https://doi.org/10.1007/BF02866913

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