Solubilizing and catalytic properties of supramolecular systems based on gemini surfactants |
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| Authors: | A B Mirgorodskaya E I Yackevich F G Valeeva V A Pankratov L Ya Zakharova |
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| Institution: | 1. A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, 8 ul. Akad. Arbuzova, 420088, Kazan, Russian Federation
2. Moscow National University of Food Production, 33 ul. Talalikhina, 109316, Moscow, Russian Federation
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| Abstract: | Quantitative parameters characterizing the aggregation behavior of dicationic surfactants of the 12-s-12 type in aqueous solutions were determined: critical micelle concentrations, aggregation numbers, and surface potentials. The effects of the spacer length of the surfactants on their solubilizing effect with respect to hydrophobic (dye Orange OT) and water-soluble (p-nitrophenol) spectral probes and on their ability to shift acid-base equilibria were studied. The kinetics of alkaline hydrolysis of p-nitrophenyl acetate and p-nitrophenyl caprinate in 12-s-12 solutions was studied by spectrophotometry. A correlation between the micellar catalytic effect and the surface potential of micelles was established. The pronounced substrate specificity was revealed: the maximum acceleration of hydrolysis is observed in solutions of 12-6-12, attaining 1760 times for p-nitrophenyl caprinate. |
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