Photochemistry in Micellar System. I. Stabilization of the Radical Anions of Anthraquinonesulfonates

Micellar effects on the photochemical reactions of sodium 9,10-anthraquinone-2-sulfonate and disodium 9,10-anthraquinone-2,6-disulfonate were studied by means of ESR and electronic spectroscopy. In the presence of anionic and non-ionic surfactants, irradiation of the quinones in aerobic phosphate buffer (pH 8.0) gave the corresponding radical anions, which were incredibly long-living (over several weeks) as compared with irradiation without surfactant. Plausible mechanisms of the micellar effects on the stabilization of the radical anions are discussed.