Micellar effects in kinetics of reaction of alkaline hydrolysis p nitrophenylpalmitate
Abstract
Rate constants of the alkaline hydrolysis of p-nitrophenylpalmitate (PNPP) have been determined in micellar solutions containing: nonionic surfactant Triton X-100, zwitterionic surfactant 3-(dimetyldodecylammonio)-propanesulfonate (DMDAPS), cationic surfactant cetyltrimetylammonium bromide (CTAB), anionic surfactant so-dium dodecylsulfate (SDS). Also the influence of the strong electrolyte sodium bromide on the reaction rate has been studied. It has been found that at addition of non-ionic surfactants the rate constant stays almost unchanged, and in presence of sodium bromide it decreases by several times. The increase of concentration of CTAB causes slight increase and than decrease in the rate constant, but in presence of sodium bromide rate constant was reduced by an order. The zwitterionic surfactant acts similarly to the CTAB. Addition of anionic surfactant SDS leads to the sharp inhibition of the reaction. The dependences of rate constants on the type of the surfactant can be explained using the concepts of change in concentration of OH– ions in the Stern layer of the micelles depending on their surface charge. The decrease in the rate of reaction in presence of sodium bromide occurs because of competition between OH– and Br– ions in surface layer of micelles.
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