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Kinetics and mechanism of redox reaction between ADA and hexachloroiridate (IV) in acid perchlorate solutions

El Korshy M. A., Hassan R. M.

Bulletin of the Polish Academy of Sciences. Chemistry

1998

Vol. 46, No. 2

147-156

The kinetics of hexachloroiridate (IV) oxidation of N-(2-acetamido) imino diacetic acid in aqueous perchloric acid solution at a constant ionic strength of 0:1 mol dm(-3) have been investigated spectrophotometrically. The reaction was found to be firstorder in [IrCl(6)2-, second-order in (ADA) and inverse fractional order with respect to (H+). Kinetic evidence for the formation of intermediate complexes between the substrate and iridium (IV) is presented. The activation parameters have been calculated and a tentative reaction mechanism consistent with the kinetics is discussed.