| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 106 === A novel fluorescent sensor O1, containing oxadiazolyl core and two terminal imine (azomethime) moieties, was synthesized by the Suzuki coupling reaction and imine condensation. O1 exhibits weak fluorescence owing to photo-induced electron transfer (PET) and C=N isomerization. In the presence of Zn2+, the fluorescence “turns on” and its intensity increases significantly with increasing concentration of Zn2+. The chemical structure of O1 was satifactorily characterized by 1H NMR and MALDI/TOF-MS spectra. 1H NMR and FTIR spectral results confirm the formation of O1-Zn2+complex. Moreover, the Job plot reveals formation of the O1–Zn2+ complex with 1:2 stoichiometry. In the presence of strong chelating Na2EDTA the O1-Zn2+ fluorescence quenches significantly. The binding constant and limit of detection (LOD) are 6.7×108 M-2and 3.08×10-8M, respectively, estimated from titration data.
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