Observation of Large Orientation Effect on Photoinduced Electron Transfer in Rigid Porphyrin–Quinone Compounds

In order to understand the mutual orientation effect in photosynthetic electron transfer, two different kinds of quinone-linked porphyrins 1 and 2 with fixed orientation were synthesized. In the two compounds only orientation is different among various factors which control electron transfer. It has been found that the electron transfer of 1 is faster than 2 by a factor of nine.