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Abstract 1,2-Bis(3,5-dimethyl-2-thienyl)perfluorocyclopentene which shows a reversible color change from colorless to yellow by UV irradiation was synthesized. The color of the photogenerated closed-ring forms was dependent on the substitution position of the thiophene rings to the perfluorocyclopentene moiety.
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Uchida et al. (1995) studied this question.
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