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A novel squaraine derivative (SQ-1) was synthesized and characterized for the determination of cysteine. Binding with Hg 2+ as a fluorescent quencher to SQ-1 leads to absorption and emission turn-off. More significantly, the SQ-1–Hg 2+ complex exhibits a dual-channel chromofluorogenic responses to biologically important cysteine with a high sensitivity and selectivity over other natural...
A novel squaraine dye (SQ-1) was developed and its chemosensor behavior toward various metal ions was explored. SQ-1 exhibited selectivity and sensitivity to Hg 2+ and Ag + compared to other metal ions, and it can detect Hg 2+ and Ag + by use of an EDTA reversible experiment. More importantly, the SQ-1-Hg 2+ complex can also serve as a colorimetric and fluorescent...
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