Studies on photolized anthracenequinone radical by using TR- ESR spectrometer

A study of chemically induced dynamic polarization (CIDEP) spectra was made, using a highly time resolved ESR (electronic spin resonance), of photolized anthracenequinone radicals (AQ(.)) to determine the influence of surfactant micelles on the spin polarization of anthracenequinone anion. It is found that the CIDEP mechanism of photolization is mainly the radical pair mechanism (RPM) of anthracenesemiquinone radical and of ethylene glycol ketyl R-.(OH)(2) or R-. radical whose center is carbon in anthracenequinone/ethylene glycol (EG) system, but there is a certain amount of triplet state mechanism polarization (TM). When surfactant TX-100 was added, the strongly polarized anthracenesemiquinone radicals were generated and the amount of polarization of the radical pairs decreased. Moreover, some anthrocenequinone anions, AQ(.-), were generated by the partly dissociated radicals. When the triethylamine (E13N) was added to EG solution, electrons were transferred between polarized triplet anthracenequinone and E13N. The later reaction was temperature sensitive. (C) 2000 Elsevier Science B.V. All rights reserved.