A highly sensitive fluorescent sensor with aggregation-induced emission characteristics for the detection of iodide and mercury ions in aqueous solution

作者：Zhang, Rui Xue; Li, Peng Fei; Zhang, Wen Juan; Li, Nan^*; Zhao, Na^*

来源：Journal of Materials Chemistry C, 2016, 4(44): 10479-10485.

DOI：10.1039/c6tc03696a

• TURN-ON FLUORESCENCE
• LIVING CELLS
• FUNCTIONALIZED TETRAPHENYLETHENE
• COLORIMETRIC SENSORS
• SELECTIVE DETECTION
• INTRACELLULAR PH
• HG2+ DETECTION
• PROBE
• CHEMOSENSOR
• DEFICIENCY

In this work, we report a highly sensitive fluorescent sensor (TPE-QN) with aggregation-induced emission (AIE) characteristics for the detection of iodide (I-) and mercury (Hg2+) ions. TPE-QN is based on tetraphenylethene (TPE)-functionalized quinolinium salts with hexafluorophosphate (PF6-) as the counterion, and exhibits intense red emission in aqueous media when nanoaggregates are formed. In the presence of I-, the emission of TPE-QN can be effectively quenched due to synergistic electrostatic interactions and drastic collisions between aggregates of TPE-QN and I-, enabling TPE-QN to work as a fluorescent "turn-off'' sensor for I- with a detection limit of 22.6 nM. Moreover, the complex of TPE-QN and I- (TPE-QN-I) can secondarily recognize Hg2+ by showing a fluorescence "turn-on'' signal because of the high affinity between Hg2+ and I-, and the detection limit for Hg2+ is as low as 71.8 nM. Furthermore, the high selectivity and sensitivity of TPE-QN makes it quite qualified for detecting the low concentration of I- and Hg2+ in real samples such as running water and urine.

• 出版日期2016-11-28
• 单位陕西师范大学