A new boron-dipyrromethene (BODIPY) fluorescent dye aimed at sensitively detecting hypochlorite anion (ClO) has been designed, synthesized and characterized. The probe is comprised of a BODIPY fluorophore unit and a ClO specific reactive group of amidoxime. The addition of hypochlorite results in a red-shift of absorption and emission spectra of the probe accompanied by a decrease of intensity and spectra changes (A and 1/I) of the probe can achieve a good linearity to the concentration of ClO. The fluorescence probe can react to ClO rapidly (within 60 s) in a wide pH range (4-10) with high sensitivity (detection limit of 6.81 μM) and selectivity. The reaction mechanism has been proposed and confirmed by MS analysis, ClO anion oxidizes amidoxime moiety to hydroxyl group and hydroxyl group is further oxidized to formyl group in the formation of a corresponding aldehyde compound. In addition, the probe has also been successfully applied to detect ClO in tap water and river water samples by spiking a known amount of standard ClO.
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