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Title: Effect of [NaBr] on the rate of intramolecular base-assisted piperidinolysis of ionized phenyl salicylate in the presence of double-tail cationic surfactant aggregates: DDABr/NaBr/H2O nanoparticles catalysis
Authors: Razak, N A
Fagge, I I
Khan, M N
Keywords: Kinetics;Pseudophase micellar model;Counterion binding-micellar growth;Phenyl salicylate;Piperidine;Cationic micelles;Didodecyldimethylammonium bromide
Issue Date: Nov-2017
Publisher: NISCAIR-CSIR, India
Abstract: The nucleophilic reactions of piperidine with ionized phenyl salicylate (PSa) reveal a nonlinear decrease with the increase in concentration of didodecyldimethylammonium bromide (DDABr) micelles (Dn) at 35 °C and in the absence as well as presence of constant [NaBr]. The plots of pseudo-first-order rate constants (kobs) versus [Dn]) have been explained quantitatively in terms of pseudophase micellar model. Such a data treatment gives DDABr micellar binding constant (KS) of PSa. The effects of [NaBr] upon KS is explained with an empirical relationship which provides an empirical constant (KBr/S where S = PSa). The magnitude of KBr/S is the measure of the ability of ion Br to expel the co-ion PSa from the cationic micellar pseudophase to the bulk aqueous phase. The origin of the large catalytic effect of DDABr/NaBr/H2O nanoparticles on the rate of piperidinolysis of PSa is described in terms of plausible physicochemical causes.
Page(s): 1132-1142
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.56A(11) [November 2017]

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