Abstract
Apparent catalytic effects of varying concentration of CTABr/MX/H2O nanoparticles (at a constant [CTABr] and [Piperidine]) on pseudo-first-order rate constants (kobs) for the reaction of piperidine with ionized phenyl salicylate have been measured as kobs/k0 where kobs and k0 represent rate constants in the presence and absence of MX, respectively. Symbols CTABr and MX represent respectively cetyltrimethylammonium bromide and 2,3- or 3,5-Cl2BzNa with Bz⿿=C6H3CO2⿿. At 6mM CTABr, the maximum values of kobs/k0 are 7.9 and 9.0 at 300mM 2,3-Cl2BzNa and 80mM 3,5-Cl2BzNa respectively. Several-fold larger catalytic effects of 3,5-Cl2Bz⿿ than that of 2,3-Cl2Bz⿿ are attributed to ⿼8-fold larger CTABr binding constant of 3,5-Cl2Bz⿿ than that of 2,3-Cl2Bz⿿. Origin of CTABr/MX/H2O nanoparticles catalytic effects is related to the ability and efficiency of the expulsion of another counterion S⿿ by the counterion X⿿ from the cationic nanoparticles to the aqueous phase by means of the ion exchange process X⿿/S⿿ at the cationic surface of nanoparticles.
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