Detection of Zn( Ⅱ)by Tetraphenylethyene Fluorescent Probe Based on Aggregation-Induced Emission(AIE)-Excited State Intramolecular Proton Transfer(ESIPT)Effect
A aggregation induced effect(AIE)Zn2+fluorescence probe with tetrastyrene as the fluorescent group and ortho-vanillin as the recognition group was designed and synthesized.The structure of the probe was characterized by 1H NMR,MS and single-crystal X ray diffraction.The fluorescence spectra showed that the probe has good selectivity and sensitivity to Zn2+,and its fluorescence enhances with the increase of concentration of Zn2+.Through job plot and single crystal structure characterization,it was found that the probe has a 2∶1 binding mode with Zn2+,and the detection limit is 56.2 nmol·L-1.The detection mechanism was attributed to the excited state intramolecular proton transfer(ESIPT)and AlE effect.The new AIE probe can be used as a convenient tool for the analysis and determination of Zn2+.