Light-induced giant dipoles in simple model compounds for photosynthesis

摘要: The primary steps in photosynthesis involve very rapid (sub-nanosecond) electron transfer between molecular entities that are rigidly embedded within a lipid membrane and separated from each other by well-defined distances on the order of 10 A. In an attempt to simulate such systems we have studied photon-induced specially synthesized assemblies which donor moiety is acceptor rigid, saturated hydrocarbon framework variable length, 5 13 We find charge separation occur sub-nanosecond timescale with close unit quantum efficiency all cases. lifetimes resulting charge-transfer states, dipole moments approaching 70 debye units, can extend several hundred nanoseconds. Non-conjugated bridges may be important determining rate direction photo-excited natural or artificial systems.