Masahiro Irie - Diarylethene Molecular Photoswitches

Inferring from the experimental results, the cycloreversion dynamics of 20cis summarized as follows. The 1B state produced by the excitation of the closed‐ring isomer undergoes internal conversion into the 2Ac state with the time constant of 200 fs, which is followed by geometrical rearrangement with vibrational cooling in 3.0 ps. The resultant 2Ac state goes over the activation barrier (2ATS 1) into the 2Ao state with the time constant of 12 ps and finally leads to the open‐ring isomer via the 2A/1ACI(o).

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12 12 Ishibashi, Y., Fujiwara, M., Umesato, T. et al. (2017). Cycloreversion reaction of a diarylethene derivative at higher excited states attained by two‐color, two‐photon femtosecond pulsed excitation. J. Am. Chem. Soc. 139: 17159–17167.

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