Photoinduced electron-transfer and magnetic-field effects on the decay rates of photogenerated biradicals in a phenothiazine-C60 linked compound with six methylene groups: temperature dependence

Abstract

Abstract Photoinduced electron-transfer reactions and magnetic-field effects (MFEs) on the decay of photogenerated biradical in a phenothiazine-C60 linked compound with six methylene groups were examined in benzonitrile at various temperatures (283–343 K). The decay rate constants of the biradicals were dramatically decreased in the lower magnetic fields (0–0.2 T) and increased in the higher magnetic fields (0.2–1.0 T). These reverse phenomena in the MFEs were more clearly observed with the increase of temperature and are explained by the contribution of spin-lattice relaxation mechanism due to anisotropic Zeeman interaction. The temperature dependence on the MFEs supports the above mechanism. To cite this article: S. Moribe et al., C. R. Chimie 9 (2006).