The influence of cationic mixed micelles composed of quartenary ammonium surfactants on hydrolysis reactions has been studied in detail. The basic hydrolysis of N-methyl-N-nitroso-p-toluene sulphonamide has been chosen as the reaction probe, while mixed micelles composed of lauryl trimethyl ammonium chloride and octadecyl trimethyl ammonium chloride with different molar ratios were studied as the reaction medium. The ion-exchange pseudophase model was used to fit the experimental results to obtain the kinetic and thermodynamic parameters of the reaction. The result show that the hydrophobic character of the mixed micelles drives the association of the substrate to them, leading to a local increase of reactant concentrations at the micellar interface and, therefore, to a catalytic effect. By tuning the molar ratio of the mixed micelles it is possible to control substrate binding affinity and thus the catalytic efficiency of the reaction medium.
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Financial support from the Spanish MINECO (MAT 2013-45168-R) is gratefully acknowledged.
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Fernández, I., Pérez-Juste, J. & Hervés, P. Cationic Mixed Micelles as Reaction Medium for Hydrolysis Reactions. J Solution Chem 44, 1866–1874 (2015). https://doi.org/10.1007/s10953-015-0383-4
- Mixed micelles
- Microheterogeneous media