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- W2017503713 abstract "Abstract Herein, we present an effective strategy based on coordination induced deaggregation signaling to create water-soluble fluorescent probes for the detection of mercury ion by introducing the thioether group linkage into squaraine-aniline dyads. Three unsymmetrical squaraine dyes tethered with thiopodand chains in different length were synthesized accordingly. The deaggregation process of the aggregated squaraine dyes triggered by Hg 2+ was elucidated in detail. Firstly, the aggregation behavior of squaraine dyes with varying thioether chains in aqueous solutions has been investigated. Secondly, the complexation ability of squaraines with Hg 2+ was found to be strengthened by increasing the length of the thioether chain. Additionally, an aggregated squaraine solution was designed by adding trace amount of non-ionic surfactant to solubilize the dye in pure water for the detection of Hg 2+ . Significantly, the aggregated state of squaraine molecules was selectively broken by Hg 2+ ions despite a wide range of other interfering metals in water media. Under optimum conditions, the fluorescence recovery was linearly proportional to the concentration of Hg 2+ between 0.03 and 1.8 μM and the detection limit was as low as 6.6 nM (1.3 ppb). Further study of the mechanism by absorption and emission spectroscopy, MS, 1 H NMR and IR titration showed that a 1:1 complex was formed between squaraine and Hg 2+ ion." @default.
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- W2017503713 date "2014-07-01" @default.
- W2017503713 modified "2023-10-03" @default.
- W2017503713 title "A coordination driven deaggregation approach toward Hg2+-specific chemosensors based on thioether linked squaraine-aniline dyads" @default.
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- W2017503713 doi "https://doi.org/10.1016/j.snb.2014.03.021" @default.
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