A Colorimetric and Ratiometric Fluorescent Chemosensor for Fluoride Based on Proton Transfer |
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Authors: | Chuandong Jia Biao Wu Jianjun Liang Xiaojuan Huang and Xiao-Juan Yang |
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Institution: | (1) State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100049, China; |
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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 1H and 19F NMR experiments. The sensor gave the largest ratiometric fluorescent response reported so far (Rmax/Rmin = 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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