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Kinetic and Mechanistic Studies on the Reaction of DL-Methionine with [(H2O)(tap)2RuORu(tap)2(H2O)]2+ in Aqueous Medium at Physiological pH

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Author(s): Tandra Das | A. K. Datta | A. K. Ghosh

Journal: Research Letters in Inorganic Chemistry
ISSN 1687-6806

Volume: 2009;
Date: 2009;
Original page

ABSTRACT
The reaction has been studied spectrophotometrically; the reaction shows two steps, both of which are dependent on ligand concentration and show a limiting nature. An associative interchange mechanism is proposed. Kinetic and activation parameters (k1∼10−3s−1 and k2∼10−5s−1) and (ΔH1  ≠=13.8±1.3 kJ mol−1, ΔS1  ≠=−250±4 JK−1 mol−1, ΔH2  ≠=55.53±1.5 kJ mol−1, and ΔS2  ≠=−143±5 JK−1 mol−1) have been calculated. From the temperature dependence of the outer sphere association equilibrium constant, thermodynamic parameters (ΔH1  ∘=16.6±2.3 kJ mol−1 and ΔS1  ∘=95±7 JK−1 mol−1; ΔH2  ∘=29.4±3.2 kJ mol−1 and ΔS2  ∘=128±10 JK−1 mol−1) have also been calculated.

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