A novel photochromic diarylethene 1a with a fluorescent chromophore in the bridge moiety was synthesized. 1a showed fluorescent switching properties in solution with UV/VIS irradiation, accompanying the ring-opening and ring-closed photoisomerization of diarylethene 1a. Addition of acid to a solution of 1a produced protonated compound 2a, and 2a also showed fluorescent switching properties with UV/VIS irradiation.
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Xie et al. (2006) studied this question.
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