2，2，2-胺三乙酰-吡啶及其稀土配合物的合成、表征与荧光性质

Synthesis,Characterization and Fluorescent Properties of 2,2,2-amine tri Acetyl-pyridine and Its Rare Earth Complexes

为了研究三脚架型配体与其稀土配合物荧光性质的关系,合成了三脚架型配体——2,2,2-胺三乙酰-吡啶及其6种稀土配合物。通过元素分析、摩尔电导、红外光谱、核磁共振波谱、差热-热重分析和荧光光谱等分析手段对配体及其稀土配合物的组成、性质进行了表征。结果表明,配合物的组成为Re(NO3)3·L·6H2O(Re=Ce3+,Sm3+,La3+,Tb3+,Y3+,Eu3+);在DMF中属于2∶1型电解质,其中,配合物中既存在以单齿形式与中心离子配位的NO3-,也存在游离的NO3-。荧光光谱分析表明,Tb(Ⅲ)配合物具有较强的Tb3+特征线状荧光,说明T(L)→5D4(Tb)的能级较匹配,从而使Tb3+荧光发射大大增强。同时,研究了溶剂中荧光增强效应,说明在极性较强、中性体系中配体对Tb3+的敏化作用较强。

To study the coordinating relations between tripodal ligands and the fluorescent properties of rare earth ions and their complexes, a tripodal ligand, 2,2,2-amine tri acetyl-pyridine and its 6 complexes with rare earth nitrates are synthesized. The formula and properties of these ligand and complexes are characterized by elemental analysis,IR spectra,molar conductivity,1^H-NMR spectra,thermal analysis and luminescence spectra. Results show that new complexes have the general formula of Re（NO3）3· L · 6H2O（Re=Ce^3＋ ,Sm^3＋ ,La^3＋ ,Tb^3＋ ,Y^3＋ ,Eu^3＋ ）. They are 2 ： 1 type eletrolytes in DMF solution. NO3^- in monodentale form can coordinate with the central cations. The fluorescent properties of Tb（ Ⅲ ）are the best sharp spectral lines. It is attributed to the efficient energy transfer betweens 5^D4 （central rare earth ions ）and ligands（T）. At same time the enhancement effect of luminescence intensity is studied. It＇s showed that the tripodal ligand is a good sensitizer in stronger polar and neutral solvents.