Kinetics and mechanism of the oxidation reaction of ascorbic acid by Cu(II)

Abstract

The title reaction of ascorbic acid (H2A) was studied at [Cu2+] >> [H2A] and [H+] >> [H2A]. The effect of chloride anion on the kinetics and mechanism has been examined at [H+] = 1.00 ?10-3 mol dm-3 and the chloride concentration up to 7.00 ?10-3 mol dm-3. The Arrhenius activation energy is 68.1 kJ mol-1. The stop-flow spectrum shows that no CuHA+ complex is formed in the system of Cu(II)-ascorbic acid, but the complex ClCuHA is formed in the presence of Cl-.

Key words: OXIDATION, REACTION MECHANISM, REACTION KINETICS, COPPER, VITAMIN C

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Cite this article

XU JIN. Kinetics and mechanism of the oxidation reaction of ascorbic acid by Cu(II)[J]. Acta Chimica Sinica, 1989, 47(4): 313-318.

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