A novel coumarin-based switching-on fluorescent and colorimetric sensor for F |
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Authors: | Jianwei Li Zunsheng Cai |
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Institution: | a Department of Chemistry, Nankai University, Tianjin 300071, PR China b Key Laboratory of Functional Polymer Materials of Ministry of Education, Nankai University, Tianjin 300071, PR China |
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Abstract: | A novel turn-on fluorescent and colorimetric sensor, N-(4′-nitrophenyl)-2-oxo-6-(phenylazo)-2H-chromene-3-carbohydrazide (1), for fluoride in dimethyl sulfoxide (DMSO) was designed and synthesized. The binding ability evaluated by UV-vis and fluorescence titration experiments reveals that 1 can selectively recognize fluoride. In particular, addition of F− to the DMSO solution of 1 resulted in an enhancement in fluorescence intensity at 338 and 352 nm, which can provide a way of ‘naked-eye’ detection for fluorides. The spectral change of 1 is due to the anion-induced increase of the charge density in and the rigidity of the host molecule. Furthermore, the binding mode with F− was investigated by 1H NMR experiments. |
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Keywords: | Anion recognition Fluorescence Fluoride Switch-on Naked-eye detection |
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