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Issue 8, 2017
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A turn-on AIE active fluorescent sensor for Hg2+ by combination of 1,1-bis(2-pyridyl)ethylene and thiophene/bithiophene fragments

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Abstract

Fluorescent sensors for Hg2+ that combine aggregation-induced emission (AIE) activity of tetraarylethylenes with metal chelating 1,1-bis(2-pyridylethylene) fragments and thiophene/bithiophene substituents have been prepared and characterized. The sensors exhibit red-shifted and enhanced emission in the presence of Hg2+ in aqueous solution while exhibiting little to no change in fluorescence in the presence of other metal ions. Job plot analyses indicate 2 : 1 sensor : Hg2+ binding stoichiometries in solution. 1H-NMR spectroscopy was also employed to investigate solution phase binding interactions between the sensors and Hg(ClO4)2, and a chelated HgI2–bis(pyridyl) complex has been characterized by X-ray crystallography. The limit of detection for Hg2+ was determined to be 48 nM. In contrast, the fluorescence of structurally analogous materials possessing quinoline rings in place of pyridine groups is completely quenched in the presence of Hg(ClO4)2. The high sensitivity and selectivity displayed by these sensors for Hg2+ over other metal ions may enable monitoring of mercury in aqueous environments.

Graphical abstract: A turn-on AIE active fluorescent sensor for Hg2+ by combination of 1,1-bis(2-pyridyl)ethylene and thiophene/bithiophene fragments

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Publication details

The article was received on 21 Feb 2017, accepted on 21 Apr 2017 and first published on 27 Apr 2017


Article type: Research Article
DOI: 10.1039/C7QM00085E
Citation: Mater. Chem. Front., 2017,1, 1654-1661
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    A turn-on AIE active fluorescent sensor for Hg2+ by combination of 1,1-bis(2-pyridyl)ethylene and thiophene/bithiophene fragments

    M. T. Gabr and F. Christopher Pigge, Mater. Chem. Front., 2017, 1, 1654
    DOI: 10.1039/C7QM00085E

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