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Kinetics of Fe(II) reduction of cis ‐halogeno(dodecylamine) bis(ethylenediamine)‐ cobalt(III) complex ion in aqueous solutions
Author(s) -
Santhakumar K.,
Kumaraguru N.,
Arunachalam S.,
Arumugham M. N.
Publication year - 2006
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.20142
Subject(s) - chemistry , ethylenediamine , cobalt , aqueous solution , reaction rate constant , ionic strength , kinetics , inorganic chemistry , micelle , reaction rate , pulmonary surfactant , ion , catalysis , organic chemistry , biochemistry , physics , quantum mechanics
Kinetics of reduction of the surfactant complex ions, cis ‐chloro/bromo (dodecylamine)bis(ethylenediamine)cobalt(III) by iron(II) in aqueous solution was studied at 303, 308, and 313 K by spectrophotometry method under pseudo‐first‐order conditions, using an excess of the reductant. The second‐order rate constant remains constant below critical micelle concentration (cmc), but increases with cobalt(III) concentration above cmc, and the presence of aggregation of the complex itself alters the reaction rate. The rate of reaction was not affected by the added [H + ]. Variation of ionic strength ( μ ) influences the reaction rate. Activation and thermodynamic parameters have been computed. It is suggested that the reaction of Fe 2+ (aq) with cobalt(III) complex proceeds by the inner‐sphere mechanism. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 38: 98–105, 2006