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Kinetic study of the interaction of three glycine-containing dipeptides with diaquaethylenediamineplatinum(II) in aqueous medium

✍ Scribed by Subhasis Mallick; Subala Mondal; Arup Mandal; Biplab K. Bera; Parnajyoti Karmakar; Alak K. Ghosh

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
200 KB
Volume
43
Category
Article
ISSN
0538-8066

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✦ Synopsis

The kinetics of the interaction of three glycine-containing dipeptides, namely, glycine-L-leucine (Gly-Leu), glycine-L-isoleucine (Gly-Ile), and glycine-valine (Gly-Val) with [Pt(en)(H 2 O) 2 ](ClO 4 ) 2 has been studied spectrophotometrically as a function of [substrate complex], [dipeptides] and temperature at a particular pH(4.0), where the substrate complex exists predominantly as the diaqua species and the dipeptides as a zwitterion. The substitution reaction shows two consecutive steps; the first is the ligand-assisted anation and the second is the chelation step. The activation parameters for both the steps were evaluated using Eyring's equation. The low H = 1 and large negative value of S = 1 as well as H = 2 and S = 2 indicate an associative mode of activation for both the aqua ligand substitution processes.

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