摘要
合成了七种不同掺杂比例的稀土高氯酸盐(铕掺镧)与2-噻吩甲酸-邻菲咯啉的固态配合物,对配合物进行了元素分析、稀土络合滴定、摩尔电导测定,确定了配合物组成为(Eu1-xLax)·L3·phen·1/2H2O(x=0·000～0·200,L为2-噻吩甲酸,phen为邻菲咯啉),并测定了配体及配合物的IR谱及荧光激发和发射光谱。摩尔电导数据表明,此类配合物为非电解质。红外光谱测定表明,配体2-噻吩甲酸羧基氧与稀土离子配位,配体1,10-邻菲咯啉两个氮原子与稀土离子配位。荧光光谱测定表明,Eu3+处于无反演对称中心格位上,Eu3+配合物发射强度增大。配合物中La3+对Eu3+的发光产生敏化增强效应,当La3+掺入量为0·005mol时敏化强度最大,随着La3+浓度的增大,对Eu3+的发光敏化强度降低。
Seven solid complexes of proportional mixed complexes（Eu^3＋ mixed with La^3＋） of rare earth perchlorate with the 2-thiophene carboxylic acid and 1.10-phenanthroline were synthesized.By elemental analysis,coordination titration and molar conductance measurement,the composition of the complexes were suggested to be（Eu1-xLax）·L3·phen·1/2H2O（x=0.000-0.200,L as 2-thiophene carboxylic acid and phen for 1.10-phenanthroline） respectively.The ligands and coordination compounds were studied by means of IR spectra and fluorescence excitation and emission spectra.The molar conductivities in DMF solvent suggested that the complexes are nonelectrolyte.IR spectra studies indicate that the 2-thiophene carboxylic acid ligands bonded with RE（Ⅲ） through oxygen atoms in carboxyl group and 1.10-phenanthroline ligand is bonded to RE（Ⅲ） through nitrogen atoms.In the fluorescence spectra it was found that the Eu^3＋ complex has no symmetrical center.La^3＋ has a great influence on the luminescence of Eu^3＋.The fluorescence emission intensity of Eu^3＋ was enhanced by La^3＋ and the fluorescence intensity with x=0.050 is much higher.With La^3＋ concentration increasing the luminescence of Eu^3＋ is less intense.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2008年第3期527-529,共3页
Spectroscopy and Spectral Analysis
基金
内蒙古大学“513”三层次人才基金项目
国家自然科学基金项目(20461002)资助
