一种双官能团配体及其铕(Ⅲ)配合物的合成与光谱性质

Syntheses and luminescence properties of a difunctional ligand and its Eu(Ⅲ) complexes

本文采用经典Claisen酮酯缩合法,合成了一种新型双官能团配体6-对甲基苯甲酰乙酰基-2-吡啶甲酸(H2L),通过红外光谱、核磁共振谱和质谱对其结构进行了表征。以H2L为配体合成了铕的二元配合物和1,10-菲咯啉为第二配体的三元配合物,并通过红外光谱、差热热重分析、荧光光谱对配合物进行了表征及其发光性质研究。结果表明:所有配合物均能发射铕(Ⅲ)的特征光谱,最强发射峰在615nm左右,配体极好地敏化了稀土离子的发光。第二配体的引入使三元配合物的荧光强度明显大于二元配合物的荧光强度。

A novel difunctional ligand,6-methylbenzoylacetyl-2-pyridinecarboxylic acid（H2L） ,was synthesized by classical Claisen keto-ester condensation reaction. And its chemical structure was confirmed by IR,^1H NMR and MS. Its corresponding binary Eu （Ⅲ ） complex and ternary complex with 1,10-phenanthroline as the second ligand were prepared. And their structures and lumines- cent properities were investigated by IR,TG-DTA and fluorescence spectra. The results showed that the complexes under UV excita- tion could emit a strong characteristic fluorescence of Eu （Ⅲ）, the ligand was an excdlent sensitizer to Eu （ Ⅲ ）, and the fluores- cence intensity of the ternary complex was significantly greater than that of the binary complex.