Sensor 1 could undergo an oxidative cyclization reaction and then generate hydroxyphenylbenzoxazole 2 when CN⁻ was present as a catalyst. The cyclization product 2 displayed fluorescence properties in the micellar due to the AIEE as well as ESIPT effect. This reaction process could be used for the light-up detection of CN⁻ in water.
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Liang et al. (2017) studied this question.
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