摘要
以两种不同结构的羧酸苯乙酸和苯基羟基乙酸与氯化铽为原料,采用低温固相反应合成了两种羧酸铽配合物。经元素分析、稀土络合滴定、摩尔电导确定了配合物的组成为:Tb(L1)3.H2O,Tb(L2)3.4H2O(L1=C6H5CH COO-,L2=C6H5CH(OH)COO-)。测定了配体及配合物的IR谱、1H NMR及配体的磷光光谱和铽配合物荧光激发和发射光谱。根据磷光发射光谱数据计算了配体的三重态能级值。比较两个配合物的荧光发射主峰5D4→7F5强度:苯基羟基乙酸铽为苯乙酸铽的5倍。由此可见在配体亚甲基上引入拉电子基团羟基,将会扩大共轭体系π电子的离域范围,提高能量传递效率,提高稀土离子的发光强度。
Two solid complexes of terbium with phenylacetic acid （L1） and phenyl-hydroxylacetic acid （L2） were synthesized by solid state reaction at low temperature, and the complexes were characterized by chemical analysis. Elemental analysis and rare earth coordination titration studies suggested that the composition of the complexes is Tb（L1 ）3 · H2 O and Tb（L2 ）3 · 4 H2 O respectively. IR spectra and 1 H NMR studies indicated that the coordination fashion of the two ligands with Tb（ Ⅲ） is different. The ligand （L1） is bonded with Tb（Ⅲ） ions by two oxygen atoms in carboxyl group which coordinate as a symmetrical chelate bidentate group. The ligand （L2） is bonded with Tb（ Ⅲ） ions by one oxygen atom in carboxyl group. The molar conductivity in DMSO solvent indicates that all complexes are non-electrolyte. The fluorescence spectra of complexes and phosphorescence spectra of the ligands showed that all of the two ligands were sensitized differently by Tb^3＋ ions for fluorescence intensity, which indicates that the triplet state energy of ligands and the different structure of complexes play an important role in the 1 of complexes. Fluorescence intensity of Tb（L1 ）3 · H2O is smaller than that of Tb（L2）3 · 4H2O. So the structure of ligand carboxylic acid has an effect on Tb^3＋ luminescence in these complexes.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2007年第7期1279-1282,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(20461002)
内蒙古高等学校科学基金项目(NJ06047)
内蒙古大学"513"二层次人才基金项目资助
关键词
铽
羧酸铽配合物
低温固相反应
发光
Terbium
Different structural aromatic carboxylic acid
Low temperature solid state reaction
Luminescence
