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Reaction of 2,2′‐azinobis (3‐ethylbenzothiazoline‐6‐sulfonic acid (ABTS) derived radicals with hydroperoxides. Kinetics and mechanism
Author(s) -
Aliaga C.,
Lissi E. A.
Publication year - 1998
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1998)30:8<565::aid-kin5>3.0.co;2-q
Subject(s) - chemistry , abts , radical , hydrogen peroxide , sulfonic acid , kinetics , radical ion , peroxide , reaction rate constant , medicinal chemistry , reaction mechanism , photochemistry , organic chemistry , antioxidant , catalysis , ion , physics , quantum mechanics , dpph
Tert ‐Butyl hydroperoxide and hydrogen peroxide readily react with the radical cation derived from 2,2′‐azinobis(3‐ethylbenzothiazoline‐6‐sulfonic acid) (ABTS). The reaction is inhibited by ABTS and protons, and can be interpreted in terms of a mechanism comprising a partially reversible electron transfer ROOH+ABTS •+ ↔ ROO · + ABTS + H + (1) followed by the self‐reactions of the hydroperoxide derived radicals and reactions between them and another ABTS derived radical. A complete kinetic analysis allows an evaluation of the rate constant for reaction (1). A value of 0.2 M −1 s −1 was obtained for both compounds. The back reaction of process (1) is more relevant when tert ‐butyl hydroperoxide is employed. © 1998 John Wiley & Sons, Inc. Int J Chem Kinet 30: 565–570, 1998