Fig. 8
Crystal structure change due to the photo-triggered phase transition. a–d Molecular conformation a without and b under ultraviolet (UV) light at −50 °C, and c without and d under UV light at 50 °C. Two independent molecules in the β-phase are shown in green (molecule 1) and yellow (molecule 2); an independent molecule in the γ-phase is drawn in green due to the similarity to molecule 1 of the β-phase. Tert-butyl substituent is disordered between two conformations drawn in magenta and blue. Dots represent the minor orientation of the disordered tert-butyl substituent. Hydrogen atoms are omitted for clarity. Crystallographic data are summarized in Supplementary Table 3
