科研之友
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摘要
A fluorescent chemosensor for Cu2+ has been developed based on the aggregation-induced emission (AIE) characteristics of bis(pyridin-2-ylmethylene) terephthalohydrazide (1). The dye molecule 1 exhibits a large Stokes shift of similar to 182 nm and shows highly sensitive and selective response to Cu2+ over other metal ions by forming a 1:2 metal-to-ligand complex in aqueous solution. Cu2+-induced fluorescence quenching at 516 nm was proportional to the concentration of Cu2+ in the range of 0.2-8.0 mu M, with a detection limit as low as 160 nM. In addition, by taking advantage of its AIE characteristics, compound 1 can also enable the fabrication of test papers for in-field detections, which is challenging for many other fluorescent Cu2+ sensors due to their strong self-quenching effect in solid state.
