Micellar catalysis of composite reactions. I. Micellar effect on the consecutive first order reaction

摘要

The micellar catalytic model for the consecutive first order reaction has been proposed in this paper. It was applied to the alkaline hydrolysis of dimethyl phthalate in micellar solutions of surfactants (CT AB, SDS and Triton X-100), and the alkaline hydrolysis of bis (2,4-dinitrophenyl) phosphate in CT AB micellar solution. Rate constants obtained in micellar phase indicate that the two steps of alkaline hydrolysis of dimethyl phthalate are both inhibited by all of the surfactants investigated, CT AB micelle exhibits a greater catalytic effect on the alkaline hydrolysis of bis (2,4-dinitrophenyl) phosphate, this may be arised from the local concentration effect of hydroxide ion in CT AB micellar phase. Nevertheless, the second order rate constant of bis-(2,4-dinitrophenyl) phosphate in the micellar phase is smaller than that in the bulk phase.