对氨基马尿酸铽二元、三元配合物的合成、表征及荧光光谱研究

在乙醇溶液中以邻菲咯啉(phen)、2,2’-联吡啶(bipy)和对氨基马尿酸(PAH，HL)为配体与铽离子(Tb(Ⅲ))合成了二元和三元稀土配合物。通过元素分析、差热-热重分析、紫外光谱、红外光谱分析，确定了配合物的组成为TbL₃(1)、TbL₃·phen·H₂O(2)和TbL₃·bipy·H₂O(3)，并讨论了配合物1～3的谱学性质和荧光性能。推测出羧基中的氧原子以桥式双齿的形式与稀土离子配位。由红外光谱和热分析测试确定的配合物1及配合物2中的水分子未参与配位。研究表明，铽配合物在489，583和621 nm处出现发射峰，它们分别归属于5D₄→7F₆,5D₄→7F₅,5D₄→7F₄和5D₄→7F₃的跃迁。其中544 nm处5D₄→7F₅跃迁的强度最强，配体的共平面性和共轭性越大，配合物的荧光性能越高，三元配合物TbL₃·phen·H₂O和TbL₃·bipy·H₂O的荧光强度优于二元配合物TbL₃的荧光强度。

Synthesis,Characterization and Fluorescent Property of Terbium Binary and Ternary Complexes with p-Aminohippuric Acid

A series of binary and ternary rare-earth compounds were synthesized by the reaction of terbium ion with p-aminohippuric (PAH, HL) acid and phenanthroline (phen) or 2,2’-bipyridine(2,2’-bpy) in the ethanol solution. The compositions of the complexes were deduced to be TbL3(1), TbL3·phen·H2O(2) and TbL3·bipy·H2O(3) by elemental analysis, TG-DTA, UV-Vis and IR, and the spectra and fluorescent properties of the complexes 1-3 were discussed. The oxygen atoms of the carboxylate group were coordinated with the rare-earth ion in bridging bidentate mode. The result shows that the higher the extent of the ligand coplanarity and conjugation, the better the fluorescent performance of the compound. The fluorescent intensity of the ternary complexes 2 and 3 are stronger than that of the binary complex 1.