Triplet electron transfer and time-resolved EPR: Detection of the radical-pair state of a covalently linked porphyrin—quinone

Abstract Triplet electron transfer is observed in a covalently linked porphyrin-quinone in ethanol at temperatures between 160 and 130 K. Both, the primary porphyrin triplet state T PQ and the radical pair + (PQ − ) T created by light-induced charge separation, are observed by time-resolved EPR. The latter is identified by its g factor and dipolar splitting.