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Micellar effects on the rates of the condensation reaction between copper(II)-histidine complex and ninhydrin

✍ Scribed by Kabir-ud-Din; M. Akram; Md. Z. A. Rafiquee; Z. Khan

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 154 KB
Volume: 31
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1999)31:10<729::aid-jck6>3.0.co;2-g

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✦ Synopsis

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 ϭ 5.0). Similarly in aqueous solution, the reaction followed irreversible first-order kinetics with respect to [Cu(II)-histidine] ϩ and fractional-order with respect to [Ninhydrin]. Although the reaction mechanism remained unaltered by micelles, a typical -[CTAB] profile was observed, that is, with a progressive increase in [CTAB], the k 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 shows the formation of a well-structured activated # ⌬S 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.

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