Kinetics and mechanism of reduction of hexachloroiridate (IV) by kojic acid in aqueous perchlorate solutions

• Autorzy: Ahmed G. A. W. , Hassan R. M.
• Języki publikacji: EN

Abstrakty

EN

The kinetics of kojic acid reduction of hexachloroiridate (IV) in aqueous perchlorate solutions at constant ionic strength of 1.0 mol dm (-3) has been investigated spectrophotometrically. The reaction showed a first-order dependence in [IrCle]2" and a fractional-order with respect to kojic acid concentration. Kinetic evidence for the formation of an intermediate complex via free-radical mechanism is presented. The results obtained indicate that increasing the [H+] is accompanied by an appreciable acceleration of the rate of reaction at pH's< 0.4. The activation parameters have been evaluated and a tentative reaction mechanism consistent with the results is suggested.

Słowa kluczowe

EN

kojic acid; hexachloroiridate; oxidation; kinetic

PL

kwas kojowy; utlenianie; kinetyka chemiczna

• Wydawca: Centrum Upowszechniania Nauki PAN
• Czasopismo: Bulletin of the Polish Academy of Sciences. Chemistry
• Rocznik: 2001
• Tom: Vol. 49, No. 3
• Strony: 235--244
• Opis fizyczny: Bibliogr. 22 poz.

Twórcy

autor

Ahmed G. A. W.

autor

Hassan R. M.

• Department of Chemistry, Faculty of Science, Assiut University, Assiut 71516, Egypt