Kinetic assessment of relative counterion penetration into cationic micelles: Effects of inert salt on the rate of piperidinolysis of phenyl salicylate in alkaline cationic micellar medium

Pseudo-First order rate constants tor piperidinolysis of ionized phenyl salicylate, obtained at 0.1 M piperidine, constant concentration of CTABr micelles and varying values of [NaOC6H4CO2Na], follow the empirical relationship: k(obs) = (k(0) + theta K-X/S[MX])/(1 + K-X/S[MX]), where theta and K-X/S are empirical constants, MX = NaOC6H4CO2Na and k(0) = k(obs) at [MX] = 0. The values of theta and K-X/S are explained in terms of pseudophase micellar model Coupled with an empirical relationship: K-S = K-S(0)/(1 + K-X/S[MX]), where K-X/S is an empirical constant and K-S and K-S(0) are CTABr micellar binding constants of PS- (i.e., S = PS-) in the presence and absence of MX, respectively.