Citation: FANG Jun-An, ZHANG Hong, ZHANG Ling-Fei, MU Lan, ZENG Xi, ZHAO Jiang-Lin, WEI Gang. A Colorimetric Probe for Detection of AcO-, F- and OH- Based on Solvent Effect and Wavelength Resolution[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(11): 1739-1747. doi: 10.11895/j.issn.0253-3820.171442
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With nitroaniline and 8-hydroxy-2-methylquinoline as the raw materials, an intermediate of 2-hydroxy-5-(4-nitroazobenzene) benzaldehyde was prepared for synthesizing 2-[2-hydroxy-5-(4-nitroazobenzene) styryl]-8-hydroxyquinoline by microwave reaction in acetic anhydride. An azo conjugate structure was formed by connecting the quinoline ring and the benzene ring with the double bond and azo in the probe molecule. The hydroxyl and nitrogen atoms provided good anion recognition sites that could selectively recognize F-, AcO- and OH- ion through hydrogen bonding in the probe. The probe could formed a 1:1 complex with F- and AcO- respectively, and the ratio of absorbance at 595 nm and 350 nm (A595 nm/A350 nm) was related to the concentration of F- and AcO- with the color change from yellowish to deep blue in CH3CN/DMSO (99:1, V/V). The binding force of probe with F- decreased significantly, and the intensity of characteristic absorption peak fell sharply because of the proton effect. However, the combination of the probe and AcO- was almost impervious, and only the maximum absorption wavelength shifted purple. Therefore the probe could be used to monitor AcO- with the ratiometric detection of absorbance value at 560 nm and 350 nm (A560 nm/A350 nm) in CH3CN/H2O/DMSO (94:5:1, V/V) medium. The detection of F- and AcO- could be realized separately on the basis of solvent effect and wavelength resolution. Within pH 6-10, due to the protonation of hydroxyl in the probe, the ratio of absorption value at 355 nm and 600 nm (A355 nm/A600 nm) of probe was related to the pH value, and with the concentration increase of OH-, the color of the solution changed from light yellow to blue in DMSO/H2O (9:1, V/V) medium. A plot of the absorbance intensity as a function of pH afforded a calculated pKa value of 7.65. A visible, rapid and sensitive visual method for detection of trace amount of F-, AcO- and pH was developed on the basis of the obvious color change.
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