Sensitization of ultra-long-range excited-state electron transfer by energy transfer in a polymerized film

摘要

Distance-dependent energy transfer occurs from the Metal-to-Ligand Charge Transfer (MLCT) excited state Ru(bpy)_3~(2+*) to an anthracene-acrylate derivative (Acr-An) incorporated into the polymer network of a semirigid poly(ethyleneglycol)dimethacrylate monolith. Following excitation, Ru(bpy)_3~(2+*) to Acr-An triplet energy transfer occurs followed by long-range, Acr-~3An-Acr-An→ Acr-An-Acr-~3An, energy migration. With methyl viologen dication (MV~(2+)) added as a trap, Acr-~3An + MV~(2+)→ Acr-An~+ + MV~+ electron transfer results in sensitized electron transfer quenching over a distance of approximately 90 A.