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  • Title: A colorimetric and ratiometric fluorescent chemosensor for fluoride based on proton transfer.
    Author: Jia C, Wu B, Liang J, Huang X, Yang XJ.
    Journal: J Fluoresc; 2010 Jan; 20(1):291-7. PubMed ID: 19838773.
    Abstract:
    N-Phenyl-N'-(3-quinolinyl)urea (1) has been developed as a highly selective colorimetric and ratiometric fluorescent chemosensor for fluoride ion based on a proton transfer mechanism. Evidences for the mechanism were provided by UV-vis and fluorescence titration and especially (1)H and (19)F NMR experiments. The sensor gave the largest ratiometric fluorescent response reported so far (R(max)/R(min) = 2620) to fluoride. Taking H(+) as the "recovering reagent", the sensor can be reversibly "used" and "recovered" for several cycles with only a slight decay of the response ability.
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