Abstract
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 (A500 and 1/I512) 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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This work was financially supported by National Natural Science Foundation of China (21571088)
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(DOCX 19 kb)
Table S1
Comparison of probes for the detection of ClO- (DOCX 12 kb)
Fig. S1
Plot of fluorescence intensity I (at 512 nm) versus [ClO−] for probe AO-BODIPY (5 μM) in HEPES-EtOH solution (20 mM HEPES, 1/9, v/v, pH = 7.0, λex = 470 nm) (PNG 85 kb)
Fig. S2
The normalized absorption and emission spectra of AO-BODIPY (5 μM) in HEPES-EtOH solution (20 mM HEPES, 1/9, v/v, pH = 7.0, λex = 470 nm) (PNG 107 kb)
Fig. S3
The absorbance of AO-BODIPY (5 μM) at 500 nm as a function of concentrations of ClO- in HEPES-EtOH solution (20 mM HEPES, 1/9, v/v, pH = 7.0) (PNG 98 kb)
Fig. S4
Absorption spectra of AO-BODIPY (5 μM) upon addition of different ions and ROS (20 equiv) in HEPES-EtOH solution (20 mM HEPES, 1/9, v/v, pH = 7.0) (PNG 212 kb)
Fig. S5
The ESI-MS spectrum of the products separated from the reaction of AO-BODIPY with NaClO (10 equiv) in HEPES-EtOH solution (20 mM HEPES, 1/9, v/v, pH = 7.0) at room temperature (PNG 1396 kb)
Fig. S6
The 1H NMR spectrum of AO-BODIPY in d6-DMSO (PNG 411 kb)
Fig. S7
The 13C NMR spectrum of AO-BODIPY in d6-DMSO (PNG 397 kb)
Fig. S8
The HRMS spectrum of AO-BODIPY (PNG 435 kb)
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Wang, L., Li, B., Jiang, C. et al. A BODIPY Based Fluorescent Probe for the Rapid Detection of Hypochlorite. J Fluoresc 28, 933–941 (2018). https://doi.org/10.1007/s10895-018-2255-y
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DOI: https://doi.org/10.1007/s10895-018-2255-y