Fig. 5
Ultraviolet (UV)–visible (Vis) absorption spectra of the enol-(S)-1 crystal. a, b UV–Vis absorption spectra of an enol-(S)-1 crystal (thickness: 20 µm) on the (001) top face before and under UV light irradiation (365 nm, 5 mW cm−2) at a 20 and b 50 °C. c Difference spectra at 20 and 50 °C obtained by subtracting the spectrum before UV light irradiation from that under UV light irradiation. d Time dependence of the absorption at 450 nm under on–off UV light irradiation at 20 and 50 °C. In each panel, the absorption was expressed in terms of the absorption coefficient for normalization
