Low sensitivity of fluorescent sensors with "turn-off" response for identifying Al 3 + has limited their wide application in the field of ion sensing. Herein, this paper reports a novel fluorescence sensor (L) endowing with "turn-on" fluorescence response based on imidazo[2,1-b]thiazole for recognizing Al 3 + in aqueous solutions. Results show that the L exhibits high selectivity and sensitivity with "turn-on" fluorescence response towards Al 3 + , but also has strong anti-interference to other common ions. In addition, the excellent color change can be distinguished by naked eyes under UV light and the test papers show great potential for detecting Al 3 + in tap water. The supposed sensing mechanism of L to Al 3 + could be attributed to the inhibition of photo-induced electron transfer (PET) and chelation-enhanced fluorescence (CHEF). Such a novel design pathway is expected to offer helpful guidance for fabricating various sensors with "turn-on" fluorescence response.
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