CHARGE SEPARATION IN ZINC DIPORPHYRIN-ZINC PORPHYRIN-PYROMELLITIMIDE-QUINONE TETRADS
Tetrads 3 and 5 consisting of 1,2-phenylene-bridged zinc diporphyrin (D), zinc porphyrin (M), pyromellitimide (I), and quinone (Q) were synthesized. Upon photoexcitation, these tetrads provide fully charge separated ion pair states (D)+—M—I—(Q)−, whose lifetimes are longer than those of corresponding Q-free triads.