Kinetic and Mechanism of Electron-Transfer Reactions: Silver (I) Catalyzed Oxidation of L-Ascorbic Acid by Peroxodiphosfate in Acetate Buffers

Author(s): Narendra K. Soni , Riya Sailani , Chandra L. Khandelwal , Prem D. Sharma .

Journal Name: Current Catalysis

Volume 3 , Issue 1 , 2014

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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.

Keywords: Catalysis, kinetics, L-ascorbic acid, mechanism, silver (I), peroxodiphosfate.

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Article Details

VOLUME: 3
ISSUE: 1
Year: 2014
Page: [103 - 108]
Pages: 6
DOI: 10.2174/2211544702666131121233511

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