Photoinduced electron-transfer reactions and magnetic field effects on the decay rates of a photogenerated biradical from zinc porphyrin-viologen linked compounds in an ionic liquid

► Unique effects of temperature on electron-transfer reactions were observed in an ionic liquid. ► Unique effects of chain length on electron-transfer reactions were observed in an ionic liquid. ► Unique effects of temperature on magnetic field effects were observed in an ionic liquid. ► Unique effects of chain length on magnetic field effects were observed in an ionic liquid. ► These unique effects are probably attributable to the properties of an ionic liquid.