Journal
TENSIDE SURFACTANTS DETERGENTS
Volume 55, Issue 1, Pages 78-84Publisher
CARL HANSER VERLAG
DOI: 10.3139/113.110535
Keywords
Metal-peptide complex; Gemini surfactants; kinetics; aggregates
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Herein, we have synthesized and characterized dicationic Gemini surfactants. The effect of their micelles on the rate constant of ninhydrin with [Cu(II)-Gly-Gly](+) complex reaction was investigated under pseudo-first-order-conditions. Experiments were carried out by means of spectrophotometry. First- and fractional order dependencies on [Cu(II)-Gly-Gly](+) and ninhydrin, respectively, were found. The results indicated that the efficiency of micellar catalysis by Gemini surfactants was significantly higher as compared to single-chained surfactant cetyltrimethylammonium bromide, CTAB. The Gemini surfactant produces a catalytic effect and leveling-off regions (just like CTAB) on the reaction rate. Later, Gemini with higher concentrations gives a third region of increasing k(psi). The effect of surfactants was rationalized by hydrophobic and electrostatic interactions. The observed kinetic effects are explained by applying the Menger-Portnoy model.
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