Pulse radiolytic investigation on the reactivity of hydrated electron towards acceptors bound to cationic micelles—2. Comparison of hexadecylpyridinium chloride with benzyl chloride and benzyl alcohol as electron scavengers

Abstract

Pulse radiolysis has been used to study kinetics of scavenging of hydrated electron (e^-_aq) by hexadecylpyridinium chloride, benzyl chloride and benzyl alcohol in aqueous micellar solutions of alkyltrimethylammonium halides.

The results corroborate our earlier finding [see the first part of this series by Szajdzińska-Piȩtek E., Gȩbicki J.L. and Kroh J. (1992) Radiat. Phys. Chem.39, 117] that reactivity of e^-_aq in cationic micellar solutions depends on the kind of micelle-bound acceptor. The effect seems to be related to the effectiveness of scavengers rather than to their different locations within aggregates.

The observed influence of micelle size and counterion substitution on e^-_aq scavenging is discussed in terms of inter- and intramicellar electron transfer, and partition of the solute between aggregates and aqueous phase.