2-羟基-6-甲基尼古丁酸二元稀土配合物的合成、表征及谱学性质
The Synthesis, Characterization and Spectroscopic Properties for Binary Rare Earth Complexes with 2-Hydroxy-6-Methyinicotinic Acid

合成了4种新型2-羟基-6-甲基尼古丁酸(HA)二元稀土配合物,通过红外光谱法、元素分析法确定其组成为LnA3？3H2O(Ln =La、Eu、Gd、Tb),配体的羧基与稀土离子以螯合双齿配位.重点研究了铕和铽的配合物的荧光性能:EuA3？3H2O的电偶极跃迁与磁偶极跃迁强度比值η(5D0→7F2/5 D0→7F1)为5.9,TbA3-3H2O的η(5D4→7 F5/5 D4→7 F6)为1.9;2-羟基-6-甲基尼古丁酸对铕离子和铽离子有较强的Antenna效应；EuA3？3H2O和TbA3？3H2O的荧光寿命分别为0.84和0.58 ms;2种配合物均具有比较优异的荧光性能.
Four new binary complexes of rare earths with 2-hydroxy-6-methylnicotinic acid(HA)were synthesized and characterized by FTIR spectra and elemental analysis,and carboxyl of the ligand chelated with rare earth ions in chelating bidentate mode. The composition of the complexes was confirmed to be LnA3？3H2O(Ln=La,Eu,Gd,Tb). The fluorescence properties of Eu and Tbcomplexes were specially studied,two complexes both had good fluorescence propertie:η(D0→F2/D0→F1)of EuA3？3H2O is 5.9,η(D0→F2/D0→F1)of TbA3？3H2O is 1.9; 2-Hydroxy-6-methyl nicotine acid has a strong antenna effect on Eu and Tb; The measured fluorescence lifetime of EuA3？3H2O is 0.84 ms and TbA3？3H2O is 0.58 ms