Magnetic field effects on the photoinduced electron transfer of 10-methylphenothiazine with 4-(4-cyanobenzoyloxy)TEMPO in fluid solutions

Magnetic field effects on both the quenching of the triplet excited state of 10-methylphenothiazine (S=1) with 4-(4-cyanobenzoyloxy)TEMPO (S=1/2) and the dynamic behavior of generated radical ion pairs (S=1/2 and 3/2) were directly observed by a nanosecond laser photolysis technique. In 2-propanol, with increasing field from 0 T to 2 T, the quenching rate was decreased by (11.8±1.2)% and the yield of the escaped cation radical was increased by (90±8)%.