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  • Title: A regeneratable and highly selective fluorescent probe for sulfide detection in aqueous solution.
    Author: Wu X, Li H, Kan Y, Yin B.
    Journal: Dalton Trans; 2013 Dec 14; 42(46):16302-10. PubMed ID: 24056372.
    Abstract:
    A novel fluorescent probe based on a coumarin-dipicolylamine-Cu(2+) complex was synthesized and characterized. The probe is able to highly sensitively and selectively sense sulfide over other common anionic analytes including thiols followed by releasing ligand 1 to give a remarkable change of fluorescent intensity in aqueous solution. The probe could be regenerated by the addition of Cu(2+), and therefore the probe could be utilized repetedly to sense sulfide anions with Cu(2+) and S(2-), in turn, increased. The detection limit of the fluorescent assay for sulfide is as low as 14 nM with a rapid response time (a few seconds). Importantly, the displacement mechanism for sensing of sulfide anions was clarified through single-crystal X-ray diffraction analysis and DFT calculations. Based on this probe, a rapid, selective and sensitive fluorescence method for the detection of sulfide anions in environmental samples was established.
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