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Kinetic Study of the Interaction of Three Glycine-Containing Dipeptides with Hydroxopentaaquarhodium(III) Ion in Aqueous Medium

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Abstract

The kinetics of the interaction of three glycine-containing dipeptides, namely, glycyl-L-valine (L1-L′H), glycyl-glycine (L2-L′H) and glycyl-L-glutamine (L3-L′H), with [Rh(H2O)5OH]2+ has been studied spectrophotometrically in aqueous medium as a function of the Rh(H2O)5OH2+ and dipeptide concentrations, pH and temperature, at constant ionic strength. At pH = 4.3, the substrate complex exists predominantly as the hydroxopentaaqua species and dipeptides as zwitterions. The reaction has been found to proceed via two parallel paths: both processes are ligand dependent. The rate constants for the processes are of the order: k 1∼10−3 s−1 and k 2∼10−5 s−1. The activation parameters for both steps were evaluated from Eyring plots. Based on the kinetic and activation parameters an associative interchange mechanism is proposed for both of the interaction processes. The low \(\Delta H_{1}^{\neq}\) and \(\Delta H_{2}^{\neq}\) values and large negative values of \(\Delta S_{1}^{\neq}\) and \(\Delta S_{2}^{\neq}\) support the associative mode of activation for both processes. The product of the reaction has been characterized using IR and ESI-mass spectroscopic analysis.

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Authors and Affiliations

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

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

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  1. Biplab K. Bera
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  2. Subala Mondal
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  3. Subhasis Mallick
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  4. Arup Mandal
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  5. 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., Mondal, S., Mallick, S. et al. Kinetic Study of the Interaction of Three Glycine-Containing Dipeptides with Hydroxopentaaquarhodium(III) Ion in Aqueous Medium. J Solution Chem 41, 741–753 (2012). https://doi.org/10.1007/s10953-012-9828-1

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