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    • Keywords


      Ligand substitution; dipeptides; cis-diaqua-bis-{2-(m-tolylazo)pyridine} ruthenium(II); kinetics.

    • Abstract


      The interaction of the title complex with selected glycine-containing dipeptides(L-L'H) such as glycyl-glycine(L-L1H), glycyl-L-alanine (L-L2H) and glycyl-L-leucine(L-L3H) has been studied spectrophotometrically in aqueous medium as a function of [substrate complex], [ligand] and temperature. The reaction has been monitored at 600 nm where the spectral difference between the reactant and product is a maximum. At pH 7.4, the interaction with studied dipeptides shows two parallel steps. i.e., it shows a non-linear dependence on the concentration of dipeptides; both processes are ligand-dependent. The rate constants for the processes are: k$_1 \tilde 10^{−3}$ s-1 and k$_2 \tilde 10^{−5}$ s-1. The activation parameters were calculated from Eyring plots. Based on the kinetic and activation parameters an associative interchange mechanism is proposed for the interaction processes. From the temperature dependence of the outer sphere association equilibrium constant, the thermodynamic parameters were also calculated. The product of the reaction has been characterized by IR and ESI-mass spectroscopic analysis.

    • Author Affiliations


      Arup Mandal1 Subala Mondal1 Parnajyoti Karmakar1 Biplab K Bera1 Subhasis Mallick1 Alak K Ghosh1

      1. Department of Chemistry, The University of Burdwan, Burdwan 713 104, India
    • Dates

  • Journal of Chemical Sciences | News

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