Title:Kinetic and Mechanism of Electron-Transfer Reactions: Silver (I) Catalyzed Oxidation of L-Ascorbic Acid by Peroxodiphosfate in Acetate Buffers
VOLUME: 3 ISSUE: 1
Author(s):Narendra K. Soni, Riya Sailani, Chandra L. Khandelwal and Prem D. Sharma
Affiliation:Department of Chemistry, University of Rajasthan, Jaipur – 302055, India.
Keywords:Catalysis, kinetics, L-ascorbic acid, mechanism, silver (I), peroxodiphosfate.
Abstract:The kinetics of silver (I) catalyzed oxidation of l-ascorbic acid (H2A) by peroxodiphosfate (PDP) in acetate
buffers has been studied. Triple distilled water was employed to eliminate suspected trace metal-ion catalysis of Cu (II) or
Fe (III). The kinetics was monitored ceremetrically and the rate has been found to be independent of substrate concentration.
A plausible reaction mechanism has been suggested. Results were analysed graphically in view of complex rate
equation. The role of the catalyst has been via AgI/AgII redox cycle, Ag (II) confirming the presence of by the addition of
2,2’-bipyridyl where brown-orange color of AgI(bipy)2 complex of transient life time was observed.
