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Decomposition kinetics ofbis(biguanide)silver(III) cation in acid perchlorate media

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Summary

In acid perchlorate media, the title complex undergoes intramolecular redox decomposition generating ultimately Ag+ ion and oxidation products of the ligand. The reaction follows a simple first-order process, and the observed pseudo-first-order rate constant is given by kobs=k0+kKa/[H+] where Ka is the deprotonation constant of the parent complex; pKa is approximately 5.9 at 30°. The values of 105 k0(s−1) and 107 kKa (Ms−1) at 30°, I=1.0 M, are 9.3±0.1 and 11.8±1.3; corresponding ΔH≠ (kJ/mol), ΔS≠ (JK−1 M−1) values are 105±0.5, 23±1 and 79±8,-96±5, respectively. The results are compared with those for similar reaction of (ethylenebisbiguanide)silver(III) and effect of change in ligand structure on kinetic behaviours of these complexes is discussed.

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Authors and Affiliations

  1. Department of Chemistry, Jadavpur University, 700 032, Calcutta, India

    Subrata Dasgupta, Amitava Das & Rupendranath Banerjee

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  1. Subrata Dasgupta
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  2. Amitava Das
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  3. Rupendranath Banerjee
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Dasgupta, S., Das, A. & Banerjee, R. Decomposition kinetics ofbis(biguanide)silver(III) cation in acid perchlorate media. Transition Met Chem 14, 19–21 (1989). https://doi.org/10.1007/BF01129752

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  • DOI: https://doi.org/10.1007/BF01129752

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