羧酸铕配合物的合成、表征及光致发光

Synthesis,Characterization and Fluorescence Study of the Carboxylic Acid Complexes with Europium

合成了Eu( )与β-苯甲酰丙酸,β-苯甲酰丙烯酸,邻苯甲酰苯甲酸的固态配合物.经元素分析、稀土络合物滴定、核磁共振氢谱和热谱分析确定其组成为:OOCHCHCOO)3.H2O、EuCEu(C6H5CH2CH2COO)3.H2O、CEu(C6H5O(CC6H5C6H4COO)3·H2O.红外光谱表明,配体通过羧基氧与铕离子配位,羧基以双齿配位.配合物的荧光光谱表明,邻苯甲酰苯甲酸铕的荧光发射强度在三个系列中最强,并从配体结构出发,探讨了该荧光强弱顺序的成因,合理的解释了实验结果.

The three solid complexes of Europium (Ⅲ) with β-benzoylpropionic acid,β-benzoylacrylic acid and o-benzoylbenzoic acid are synthesized.The formulas of these complexes are COO)3·H2OZJLX,Y CHC6H4COO)3·H2O which are determind by the elemental analysis,molar conductivity,rare earth complexometry,1HNMR,TG and DTA technique.IR studies indicate that the ligand is bounded with Eu(Ⅲ) ion through its two oxygen atoms in carboxyl group which coordinate as a symmetrical chelating bidentate group. Fluorescence spectra of Eu3+ complexes show that Eu3+-o-benzolybenzoic acid has the most strength fluorescence emission in three sessions. From the structure of ligands,we discuss the reason that causes the fluorescence order and explained the experiment results reasonably.