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  • Title: Rhodamine-derived Schiff base for the selective determination of mercuric ions in water media.
    Author: Quang DT, Wu JS, Luyen ND, Duong T, Dan ND, Bao NC, Quy PT.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2011 Feb; 78(2):753-6. PubMed ID: 21215691.
    Abstract:
    A new rhodamine-derived Schiff base (RS) was synthesized and its sensing property to metal ions was investigated by UV/vis and fluorescence spectroscopies. Addition of Hg2+ ions to the aqueous solution of RS gave a visual color change as well as significantly fluorescent enhancement, while other ions including Pb2+, Cd2+, Cr3+, Zn2+, Cu2+, Fe2+, Co3+, Ni2+, Ca2+, Mg2+, K+ and Na+ ions did not induce any distinct color/spectral changes, which constituted a Hg2+-selective fluorescent OFF-ON chemosensor. The Hg2+-induced ring-opening of spirolactam of rhodamine in RS resulted in the dual chromo- and fluorogenic observation.
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