We report a 2-(4-amino-2-hydroxyphenyl)benzothiazole based Schiff-base, a potential excited state intramolecular proton transfer (ESIPT) chromophore, exhibits aggregation induced emission enhancement (AIEE) in the solvent mixture of DMSO:HB. The presence of Cu²⁺ ions promote imine hydrolysis resulting the formation of Cu²⁺ complex of 2-(4-amino-2-hydroxyphenyl)benzothiazole, with the consequent cessation of the emission process leading to “turn-off” detection of Cu²⁺. The introduction of PO₄³⁻ ions revived fluorescence emission through decomplexation of the putative Cu²⁺ complex, thereby releasing 2-(4-amino-2-hydroxyphenyl)benzothiazole in the solution. Additionally, we have successfully demonstrated the practical application of the probe by developing the portable sensor paper strips.

我们报告了基于2-（4-氨基-2-羟基苯基）苯并噻唑的席夫碱，一种潜在的激发态分子内质子转移（ESIPT）发色团，在DMSO：HB的溶剂混合物中表现出聚集诱导的发射增强（AIEE）。Cu ²⁺离子的存在促进了亚胺的水解，从而形成了2-（4-氨基-2-羟基苯基）苯并噻唑的Cu ²⁺络合物，因此发射过程的停止导致对铜的“关闭”检测。²⁺。PO ₄ ^3-离子的引入通过分解假定的Cu ²⁺使荧光发射恢复。络合物，从而在溶液中释放出2-（4-氨基-2-羟基苯基）苯并噻唑。此外，我们通过开发便携式传感器纸带成功地证明了探头的实际应用。