Solubilizing and catalytic properties of supramolecular systems based on gemini surfactants

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 solubilizin...

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Bibliographic Details
Published in:Russian chemical bulletin 2014, Vol.63 (1), p.82-87
Main Authors: Mirgorodskaya, A. B., Yackevich, E. I., Valeeva, F. G., Pankratov, V. A., Zakharova, L. Ya
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
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Inorganic Chemistry
Organic Chemistry
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Summary: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.
ISSN:1066-5285
1573-9171
DOI:10.1007/s11172-014-0398-9