Abstract
Molecular structure of an organic photocatalist, 9-mesityl-10-methylacrinium cation, at a photo-induced electron-transferred state was directly observed by a pump-probe single crystal X-ray structure analysis. Observed photo-induced structural changes were the bending of the N-methly group and the positional change of perchrolate anion, which co-exists in the crystal. Those structural changes respectively represented the reduction of the 10-methylacridinium cation and the oxidation of the mesitylene by photo-induced electron transfer. The dyhedral angle betweem 10-methylacridinium and mesitylene moieties at the electron-transferred state was almost identical with the ground one. This is a clear evidence for restriction of intramolecular back electron transfer and long-lived character of the electron-transferred state. The observed geometrical features will provide a solid basis for designing a novel artificital photosynthetic system.
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