Unusual Dynamics of Micellized Radical Pairs Generated from Photocbemically Active Amphiphiles

摘要

Photochemical reactions in heterogeneous media such as micelles have been under intense study in recent years. These involve reactions of several types: (1) those where a probe molecule is dissolved in the interior of the micelle and the photochemicalreaction takes place between the probe and the surfactant making up the micelle, (2) those which occur between the probe and a water soluble molecule on the exterior of the micelle, and (3) those which are unimolecular but are initially confined to themicelle. Magnetic field effects are often observed in micellar radical reactions due to the presence of an exchange interaction (/) between the members of the radical pair (RP). This exchange interaction has also been observed directly by time-resolved electron paramagnetic resonance (TREPR) spectroscopy,6 and its observation is the basis for a well-established theory of chemically induced electron spin polarization known as the spin-correlated radical pair (SCRP) mechanism.