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Two novel fluoride (F−) sensors based on an azo dye (solvent yellow 4) were designed and synthesized. The chemosensors exhibited selectivity and high sensitivity towards F− over other anions such as Cl−, Br−, I−, CH3COO−, C6H5COO−, and H2PO4−, as noted by the naked eye and UV–vis spectral changes in DMSO/CH3CN (1:9, v/v). An obvious change in the color of the sensor solution from pale yellow to pink...
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