Abstract
The pseudo-first order rate constant for the decomposition of p-nitrophenyl acetate in carbon tetrachloride was measured as a function of the concentration of imidazole and 2-alkylimidazoles solubilized by didodecyldimethylammonium chloride (DDAC) or bromide (DDAB) and dio(2ethylhexyl) sodium sulfosuccinate (AOT). The rate constants in the pure solvent and in the presence of surfactants were obtained from the slopes of straight lines over the lower concentration range of imidazole and 2-alkylimidazoles. It was observed that the addition of the surfactants to the reaction system increases the rate constants by several times over those in the pure solvent. The magnitude of the rate enhancement was of the order: DDAC > DDAB > AOT for the imidazole in the surfactant systems and imidazole > 2-undecylimidazole > 2-isopropylimidazole in the DDAB systems. The surfactant effect could be elucidated in terms of strength of the interaction between the surfactants and imidazole or 2-alkylimidazoles obtained from NMR and vapor pressure osmometry.
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