Study On Synthesis, Characterization And Application In Ion Identification Of Organic Fluorescent Molecules

This thesis contains two aspects. We described the synthesis and fluorescent properties of a novel 1,8-naphthalimide derivative containing potassium diacetate and 1, 8-naphthalimide derivatives containing one or two Schiff-base moieties. We also synthesised 1-(benzothiazole-2-yl)-2,5-phenyl(heterocycle)pyrazoline compounds, 2-(pyridin-2-yl)-4, 5-di(naphthalen-2-yl) imidazol, and depicted their spectral property. Firstly, a novel water-soluble 1,8-naphthalimide derivative containing potassium diacetate was obtained from 4-bromo-1,8-naphthalic anhydride by several steps.Fluorescent spectra indicated that it can detect transition-metal Pb2+ under physiological pH condition. 1,8-naphthalimide derivative containing one Schiff-base moiety were synthesized, and it's property of detection of Cu (â…¡) was also studied, further more, the Cu (â…¡) recognition gave rise to yellowgreen-to-colorless color changes that were visible to the naked-eye. A series of novel 1,8-naphthalimide derivatives containing two Schiff-base moieties were synthesized, and were characterized by UV-visible and fluorescent spectroscopic techniques, the results show that the emission of the compounds varies in the range of 520-570 nm, and may serve as good green light-emitting materials.Scendly, 1-(benzothiazole-2-yl)-2,5-phenyl (heterocycle) pyrazoline compounds were synthesised, spectral property indicated that fluorescent intensity of these compounds especially 1-(benzothiazole-2-yl)-2-(4-methoxyphenyl)-5-(pyridin-2-yl)pyrazoline was weakened by Cu2+. 2-(pyridin-2-yl)-4,5-di(naphthalen-2-yl) imidazol was synthesised, and it's fluorescent spectra also showed that it can detect Zn2+ well.