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A novel fluorescent chemosensor based on the oxadiazole, 2-(2-hydroxyphenyl)-5-(4-methoxyphenyl)-1,3,4-oxadiazole, was designed and synthesized. The interaction of the oxadiazole with different metal ions had been investigated through UV-vis absorption and fluorescence spectra in 9:1 (v/v) ethanol-water (pH=7.0) solution. The oxadiazole showed a pronounced fluorescence enhancement at 430nm upon addition of Zn in aqueous solution, whereas it had no apparent interference from other metal ions. The results indicated that the oxadiazole possessed high selectivity and sensitivity to Zn ion. The stoichiometric ratio between the oxadiazole and Zn ion was calculated to be 2:1 by Job plot experiment, meanwhile their binding modes was confirmed by H NMR and mass spectrometry. Their association constant was determined to be 1.95×10M and the detection limit for Zn ion was 6.14×10mol/L.
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| http://dx.doi.org/10.1016/j.saa.2016.11.053 | DOI Listing |
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