ION-EXCHANGE IN MICELLAR SOLUTIONS .1. CONCEPTUAL-FRAMEWORK FOR ION-EXCHANGE IN MICELLAR SOLUTIONS

The explicit consideration of ion exchange leads to a framework for the quantitative dissection and analysis of the influence of charged micelles on reactions which involve exchangeable ionic species. These include the following: (1) the binding of a reactive ion to the micelle in the presence or absence of salt and presence or absence of buffer; (2) the first-order reaction of an ionic substrate in the micelle; (3) the second-order reaction of an ionic nucleophile with a neutral substrate solubilized in the micellar phase; (4) the effect of micelles on the dissociation of weak acids; (5) the second-order reaction of the corresponding conjugate base. Model calculations based on the resulting mathematical expressions, which contain only experimentally accessible terms, are presented to exemplify the behavior patterns predicted by the model for each of these cases. These calculations illustrate the role that a given set of experimental conditions (unbuffered, buffered, added salt present, detergent concentration, etc.) plays in determining the concentration and kinetic behavior of exchangeable ionic reactants in the micellar pseudophase. © 1979 American Chemical Society.