単結晶X線構造解析による短寿命励起分子構造の可視化

抄録

Three-dimensional structure of an organic photocatalyst, 9-mesityl-10-methylacridinium ion, at a photoexcited state and photoinduced structural dynamics in tetrathiafulvalene-p-chloranil were directly observed by single crystal X-ray structure analysis. In diffraction data collection, a laser pump and X-ray probe （pump-probe） technique was applied. Drawing the Fourier maps using difference of observed structural factors between the laser-irradiated and the non-irradiated conditions presicely visualized electron densities corresponding to 1～2％ of photoexcited species in a crystal. The observed structural features of photoexcited molecules clearly reflected their photocatalitic or photoswitchable property.