Kinetics and mechanism of the reactions of platinum(II)-dipicolinate and platinum(II)-glycylglycine with oxalate ion

✍ Scribed by Sukalpa Dey; Pradyot Banerjee

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 105 KB
• Volume: 35
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.10134

✦ Synopsis

Abstract

The kinetics of the reactions of [Pt(dipic)(H~2~O)] and [Pt(digly)(H~2~O)] (where H~2~dipic = pyridine‐2,6‐dicarboxylic acid and H~2~digly = glycylglycine) with oxalate ion were studied at 25°C in aqueous medium by UV–vis spectroscopy at I = 0.1 mol dm^−3^ over an wide range of pH. A probable associative pathway may involve a five‐coordinate intermediate leading to the formation of an unidentate oxalate species, which converts to bidentate chelate in subsequent fast steps. The products are isolated and characterized by CHN analysis, IR, and ^1^H NMR spectra. The kinetic data from pH variation experiments are fitted by a computer program to a sequence of reactions and the different rate constants are evaluated. © 2003 Wiley Periodicals, Inc. Int J Chem Kinet 35: 327–333, 2003