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Autocatalytic oxidation of β‐alanine by peroxomonosulfate in the presence of copper(II) ion
Author(s) -
Kannan R. Sayee,
Easwaramoorthy D.,
Vijaya K.,
Ramachandran M. S.
Publication year - 2008
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/kin.20288
Subject(s) - chemistry , autocatalysis , copper , kinetics , sodium acetate , limiting , ion , reaction rate constant , inorganic chemistry , acetic acid , catalysis , alanine , reaction mechanism , amino acid , organic chemistry , quantum mechanics , mechanical engineering , biochemistry , physics , engineering
Kinetics and mechanism of oxidation of β‐alanine by peroxomonosulfate (PMS) in the presence of Cu(II) ion at pH 4.2 (acetic acid/sodium acetate) has been studied. Autocatalysis was observed only in the presence of copper(II) ion, and this was explained due to the formation of hydroperoxide intermediate. The rate constant for the catalyzed ( k obs 2 ) and uncatalyzed ( k obs 1 ) reaction has been calculated. The kinetic data obtained reveal that both the reactions are first order with respect to [PMS]. k obs 1values initially increase with the increase in [β‐alanine] and reach a limiting value, but k obs 2values decrease with the increase in [β‐alanine]. k obs 1values increase linearly with the increase in [Cu(II)], whereas k obs 2values increase with [Cu(II)] 2 . Furthermore, k obs 1values are independent of [acetate], but k obs 2values decrease with the increase in acetate. A suitable mechanism has been proposed to explain the experimental observation. The reaction has been studied at different temperatures, and the activation parameters are calculated. © 2007 Wiley Periodicals, Inc. Int J Chem Kinet 40: 44–49, 2008