关键词: 吡啶, 量子产率, 芳香醚-噁二唑, 合成, 荧光光谱

In order to explore new highly organic electroluminescent materials, six symmetrical aromatic oxide-oxadiazoles containing pyridine ring 4a～4f were synthesized through cyclization of substituted ben-zoic acid (2) with 2,6-dihydrazide pyridine (3) by “one-pot” method in POCl3. Their structures were con-firmed by MS, IR, 1H NMR techniques and elemental analysis. The fluorescence spectra of the target com-pounds showed that the λem ranged from 347 to 507 nm, and the maximum λem were close to 384 nm, which showed that these compounds have good fluorescence with strong fluorescence intensity. When the 5-Br group was introduced into the aromatic ring (4e and 4f), the fluorescent emission wavelength took place Einstein shift, and the fluorescent intensity decreased a little. Using quinine bisulphate as a reference, the fluorescence quantum yields were all tested, and the introduction of 5-Br group had no visible effect on fluorescence quantum yield. The fluorescence quantum yields of representative 4a in different solvents at maximum excitation wavelength were also measured and the results showed that the polarity of the solvents hardly had any relation to the fluorescence quantum yields of the target compounds.

Key words: fluorescence quantum yield, aromatic oxide-oxadiazole, synthesis, fluorescence spectrum, pyridine