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Long-lived short-distance intramolecular charge separation via intermolecular triplet sensitisation.

Sensitised excitation of the DMN[3]DCME donor[bridge]acceptor system allows population of a triplet CT state with a microsecond lifetime in polar solvents. This is more than five orders of magnitude longer than the lifetime of the corresponding singlet CT state which is populated exclusively upon direct excitation. The picture indicates the spin-forbidden nature of the charge recombination between the acceptor (red) to donor (green) moieties.