Abstract
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 kψ-[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
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