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A turn-off fluorescent probe for the detection of Cu2+ based on a tetraphenylethylene-functionalized salicylaldehyde Schiff-base
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-03-26 , DOI: 10.1039/c9qm00759h
Hai-Fang Xie 1, 2, 3, 4, 5 , Chang-Jin Yu 4, 6, 7, 8 , Ya-Li Huang 4, 5, 8, 9 , Hong Xu 4, 5, 8, 9 , Qi-Long Zhang 4, 5, 8, 9 , Xiao-Hong Sun 4, 5, 8, 10 , Xing Feng 11, 12, 13, 14, 15 , Carl Redshaw 16, 17, 18, 19
Affiliation  

A non-planar tetraphenylethylene-functionalized salicylaldehyde Schiff-base fluorescent probe (TPE-An-Py) with aggregation-induced enhanced emission (AIEE) characteristics was synthesized via a classical Knoevenagel condensation reaction, and exhibited a high sensitivity towards copper ions in aqueous media with a “turn-off” fluorescence mechanism; the limit of detection is 2.36 × 10−7 mol L−1. Importantly, the coordination mode of the probe towards copper was further evaluated by UV-vis and NMR spectroscopy and a 1 : 2 stoichiometry was identified. A single crystal X-ray diffraction study confirmed the binding mode. In addition, the AIEE fluorescent probe can be applied to the detection of Cu2+ in practical samples with satisfactory recoveries in a range of 106–111% in lake water and 97–108% in tap water.

中文翻译:

基于四苯基乙烯官能化水杨醛席夫碱的关断型荧光探针,用于检测Cu2 +

通过经典的Knoevenagel缩合反应合成了具有聚集诱导增强发射(AIEE)特性的非平面四苯基乙烯官能化水杨醛席夫碱荧光探针(TPE-An-Py),并且对水介质中的铜离子表现出高敏感性具有“关闭”荧光机制;检测极限为2.36×10 -7 mol L -1。重要的是,通过UV-vis和NMR光谱进一步评估了探针对铜的配位模式,并鉴定了1:2的化学计量。单晶X射线衍射研究证实了结合模式。此外,AIEE荧光探针可用于检测Cu 2+ 在实际样品中,回收率令人满意,在湖水中的回收率为106–111%,在自来水中的回收率为97–108%。
更新日期:2020-03-26
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