Abstract
A new chemodosimeter based on dicyanomethylene-4H-chromene chromophore (probe 1) was developed as a ratiometric fluorescent probe in near-infrared range for F(-) with good selectivity in acetonitrile. Probe 1 could be used to directly visualize F(-) by the naked eye and showed more than 621-fold fluorescence enhancement at 715nm upon reaction with F(-) upon excitation at 625nm. The recognition of probe 1 to fluoride was featured by F(-)-induced red-shifts of both absorption (185nm) and fluorescence peaks (132nm) based on internal charge transfer (ICT) in acetonitrile. The desilylation reaction of 1 by F(-) was proposed for its dual absorption and emission ratiometric detection of fluoride.
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