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Polarized optical micrographs of an azopyridine–I2 complex (see Figure 107C) at its liquid-crystalline phase before (left) and after (right) UV irradiation. The decreased contrast indicates photoinduced phase transition due to trans–cis photoisomerization. Upon irradiation with visible light, the colored pattern can be retained due to reverse cis–trans isomerization. Reprinted with permission from ref (851). Copyright 2014 Royal Society of Chemistry.
