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  • Title: Fluorescent "Turn-Off" Detection of Fluoride and Cyanide Ions Using Zwitterionic Spirocyclic Meisenheimer Compounds.
    Author: Benet M, Villabona M, Llavina C, Mena S, Hernando J, Al-Kaysi RO, Guirado G.
    Journal: Molecules; 2017 Oct 27; 22(11):. PubMed ID: 29077037.
    Abstract:
    Stable zwitterionic spirocyclic Meisenheimer compounds were synthesized using a one-step reaction between picric acid and diisopropyl (ZW1) or dicyclohexyl (ZW3) carbodiimide. A solution of these compounds displays intense orange fluorescence upon UV or visible light excitation, which can be quenched or "turned-off" by adding a mole equivalent amount of F- or CN- ions in acetonitrile. Fluorescence is not quenched in the presence of other ions such as Cl-, Br-, I-, NO₂-, NO₃-, or H₂PO₄-. These compounds can therefore be utilized as practical colorimetric and fluorescent probes for monitoring the presence of F- or CN- anions.
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