ALKALI-METAL ION CATALYSIS OF THE OXIDATION OF L-ASCORBIC-ACID BY HEXACYANOFERRATE(III) IN STRONGLY ACIDIC MEDIA

Authors
LEAL JM DOMINGO PL GARCIA B IBEAS S
Citation
Jm. Leal et al., ALKALI-METAL ION CATALYSIS OF THE OXIDATION OF L-ASCORBIC-ACID BY HEXACYANOFERRATE(III) IN STRONGLY ACIDIC MEDIA, Journal of the Chemical Society. Faraday transactions, 89(19), 1993, pp. 3571-3577
Citations number
43
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Journal title
Journal of the Chemical Society. Faraday transactions → ACNP
ISSN journal
09565000
Volume
89
Issue
19
Year of publication
1993
Pages
3571 - 3577
Database
ISI
SICI code
0956-5000(1993)89:19<3571:AICOTO>2.0.ZU;2-D
Abstract
The kinetics of the oxidation Of L-ascorbic acid by hexacyanoferrate(I II) ions have been investigated in strongly acidic media over a wide r ange of acidity. Two different mechanisms involving the monoascorbate anion, AH-, the neutral molecule of ascorbic acid AH-2, and the proton ated species AH-3+, as well as the hexacyanoferrate(III) ion Fe(CN)63- , and the monoprotonated form HFe(CN)62- are suggested. Kinetic eviden ce for a specific catalytic effect by binding of alkali-metal ions to oxidant is reported. The derived rate equations are in good agreement with the experimental observations.