Kinetis of the reaction of alkaline hydrolysis of thiophosphates in micellar and hexagonal phases of the CETYLDIMETHYLETHYLAMMONIUM BROMIDE (cas 124-03-8)/NaOH/water system.

Add time:09/10/2019    Source:sciencedirect.com

Reactivity of O-p-nitrophenyl-O,O-dimethylthiophosphate (A), O-p-nitrophenyl-O,O-diethylthiophosphate (B) and O-p-nitrophenyl-O,O-dimethylphosphate (C) in alkaline hydrolysis in the cetyldimethylethylammonium bromide (CDAB)/NaOH/water system in micellar (MI) and and hexagonal (E) phases was investigated with the help of the spectrophotometrical method. Kinetic parameters of micellar-catalysed reactions (binding constants and rate constants in micellar pseudophase) are defined from kinetic dependence kobs = f(CCDAB) in accordance with the pseudophase model. The formation of micelles results in maximum acceleration of the alkaline hydrolysis A and C by 6 and 8 times. The reaction becomes slower in an ordered E-phase in comparison with the Mi-phase for A, B and C by 16, 18 and 9 times, accordingly. The process is inhibited 3 and 5 times accordingly in comparison with aqueous alkaline hydrolysis in the E phase for A and B.

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