A benzothiazole-based fluorescent and colorimetric chemosensor BZD ((E)-2-(benzo[d]thiazol-2-yl)-5-((4-(diethylamino)-2-hydroxybenzylidene)amino)phenol) was applied for detecting ClO. BZD showed fluorescence quenching and color variation for ClO via oxidative reaction between ClO and the imine bond. It could effectively detect ClO over various competitive analytes. Detection limit for ClO was calculated to be 1.74 μM by fluorescent method and 16.44 μM by colorimetric one, respectively. Additionally, BZD could be utilized for sensing ClO in zebrafish, real water sample and paper strip. The photophysical characteristics and sensing mechanism of BZD to ClO were studied by fluorescent and UV-visible spectroscopy, NMR titration, and ESI-mass spectrometry.
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