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Issue 44, 2016
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A highly sensitive fluorescent sensor with aggregation-induced emission characteristics for the detection of iodide and mercury ions in aqueous solution

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Abstract

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.

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

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Publication details

The article was received on 26 Aug 2016, accepted on 15 Oct 2016 and first published on 17 Oct 2016


Article type: Paper
DOI: 10.1039/C6TC03696A
Citation: J. Mater. Chem. C, 2016,4, 10479-10485
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    A highly sensitive fluorescent sensor with aggregation-induced emission characteristics for the detection of iodide and mercury ions in aqueous solution

    R. X. Zhang, P. F. Li, W. J. Zhang, N. Li and N. Zhao, J. Mater. Chem. C, 2016, 4, 10479
    DOI: 10.1039/C6TC03696A

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