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Kinetics and mechanism of the reaction of hydroxopentaaquarhodium(III) ion with l-Arginine in aqueous solution

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Abstract

The kinetics of the aqua ligand substitution from hydroxopentaaquarhodium(III) ion, [Rh(H2O)5(OH)]2+, by l-Arginine has been studied spectrophotometrically as a function of Arginine concentration, and temperature, at pH 4.3. The reaction proceeds via a rapid outer sphere association complex formation step followed by two consecutive steps. The first of these involves ligand-assisted anation, while the second involves chelation as the second aqua ligand is displaced. The association equilibrium constant for the outer sphere complex formation has been evaluated together with the rate constants for the two subsequent steps. The activation parameters for both steps have been evaluated using Eyring’s equation. Thermodynamic parameters calculated from the temperature dependence of the outer sphere association equilibrium constants are also consistent with an associative mode of activation. The product of the reaction has been characterized by conductivity measurement and IR spectroscopic analysis.

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Authors and Affiliations

  1. Department of Chemistry, The University of Burdwan, Burdwan, 713104, India

    Biplab K. Bera, Subhasis Mallick, Arup Mandal, Parnajyoti Karmakar & Alak K. Ghosh

  2. Department of Paediatrics, Burdwan Medical College and Hospital, Burdwan, 713104, India

    Asok K. Datta

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  1. Biplab K. Bera
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  2. Subhasis Mallick
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  3. Arup Mandal
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  4. Parnajyoti Karmakar
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  6. Alak K. Ghosh
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Correspondence to Alak K. Ghosh.

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Bera, B.K., Mallick, S., Mandal, A. et al. Kinetics and mechanism of the reaction of hydroxopentaaquarhodium(III) ion with l-Arginine in aqueous solution. Transition Met Chem 35, 541–547 (2010). https://doi.org/10.1007/s11243-010-9361-2

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  • DOI: https://doi.org/10.1007/s11243-010-9361-2

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