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|Title:||Kinetic and mechanistic approach of the interaction of glycylglycine with cis-[Pt(en)(H2O)2](ClO4)2 and cis-[Pt(dmen)(H2O)2](ClO4)2 (en = ethyl enediamine, dmen = N,N'-dimethylethylenediamine) in aqueous medium|
|Authors:||Bera, Sujit K|
De, Gauri S
|Abstract:||The kinetics o f the interaction of glycylglycine (diglycine) with cis-[Pt(en)(H2O)2](ClO4)2 and cis-[Pt(dmen)(H2O)2](ClO4)2 (en = ethyl enediamine, dmen = N,N'-dimethylethylenediamine) have been studied spectrophotometrically as a function of [substrate complex], [glycylglycine] and temperature at a particular pH (4.0) where the substrate complex exists predominantly as the diaqua species and glycylglycine (diglycine) as the zwitterion. The reaction has been found to proceed through two consecutive steps. The first step involves the ligand assisted anation, while the second step involves chelation when the second aqua ligand is displaced. Rate constants have been evaluated using Weyh and Hamm method. Activation parameters for both the steps have also been calculated using Eyring equation. The low enthalpy of activation and large negative values of entropy of activation indicate an associative mode of activation for both steps.|
|Appears in Collections:||IJC-A Vol.43A(09) [September 2004]|
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