Balancing from FRET to SET and Further to Photochemistry

Dyads of the hypsochromically absorbing energy donor benzoperylenetriscarboximide and more bathochromically perylenebiscarboximide with various spacers were synthesized by means Sonogashira reaction where transition moments acceptor are orthogonal causing zero for geometry factor κ simple p-phenylene spacer. Exciton interactions extinguished; however, transfer RET (resonance transfer) proceeded unaltered efficiently in contrast to theory vibronic effects made responsible therefore. A lateral shift a disubstituted naphthalene as spacer was no influence. The replacement electron rich pyrene caused switch from photo-induced single (SET). very fast feeder allowed suppression formation triplets subsequent generation singlet oxygen protect dyad against photochemical degradation. Finally, influence distance between studied.