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Micellar effects on the rates of the condensation reaction between copper(II)‐histidine complex and ninhydrin
Author(s) -
Akram M.,
Rafiquee Md. Z. A.,
Khan Z.
Publication year - 1999
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(1999)31:10<729::aid-jck6>3.0.co;2-g
Subject(s) - chemistry , ninhydrin , bromide , aqueous solution , micelle , pulmonary surfactant , kinetics , copper , cationic polymerization , reaction rate , inorganic chemistry , aqueous two phase system , polymer chemistry , organic chemistry , catalysis , amino acid , biochemistry , physics , quantum mechanics
The kinetics of formation of N‐diketohydrindylidenehistidinatocopper(II) complex has been investigated in the presence of cationic cetyltrimethylammonium bromide (CTAB) surfactant in aqueous medium (pH = 5.0). Similarly in aqueous solution, the reaction followed irreversible first‐order kinetics with respect to [Ninhydrin]. Although the reaction mechanism remained unaltered by micelles, a typical k ψ ‐[CTAB] profile was observed, that is, with a progressive increase in [CTAB], the reaction rate increased, reached a maximum value, and then decreased. The results are treated quantitatively in terms of the kinetic pseudo ‐phase model. Activation parameters were also evaluated and a large decrease in ΔS # shows the formation of a well‐structured activated complex. It was found that anionic sodium dodecyl sulphate (SDS) and non‐ionic Triton X‐100 (TX‐100) surfactants have no effect on the reaction. © 1999 John Wiley & Sons, Inc. Int J Chem Kinet 31: 729–736, 1999