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Abstract
A new unsymmetrical photochromic diarylethene 1‐(3,5‐dimethyl‐4‐isoxazolyl)‐2‐ [2‐methyl‐5‐bromomethyl‐3‐thienyl] has been synthesized. Its properties have been discussed systematically in acetonitrile, such as photochromic, fluorescence switch, kinetics experiments and its optoelectronic properties. The results showed the compound exhibited reversible photochromism and undergo reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light. The kinetic experiments showed that the cyclization and cycloreversion processes were zeroth and first order reaction, respectively. The fluorescence had a remarkable initial increase with subsequent dramatic decrease with increasing concentration. Its fluorescence intensity decreased along with the photochromism from open‐ring isomers to closed‐ring isomers.
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