铽掺钇配合物[(Tb_xY_(1-x))(HL)L′Cl·1/2H_2O]的合成及荧光性质研究

Synthesis and Fluorescence Properties of the Complexes [(Tb_xY_(1-x))(HL)L′Cl·1/2H_2O]

以1,3,5-苯三甲酸根(BTC3-)为阴离子配体,1,10邻菲啰啉(phen)为中性配体,以不同摩尔比铽、钇离子为中心体,合成了系列铽掺钇配合物。经C,N,H元素分析,稀土总量络合滴定和铽、钇分量的测定推测配合物的组成为(TbxY1-x)(HL)L′Cl.1/2H2O(x=0.10,0.30,0.50,0.70,0.90,L=BTC3-,L′=phen);配合物的波谱测定结果表明,配体1,3,5-苯三甲酸根的羧基氧原子和稀土离子配位成键;1,10邻菲啰啉的氮原子与稀土离子螯合成环。荧光发射光谱测试表明,该类配合物是一类发光强度较好的配合物,不发光的钇离子对铽离子的发光有明显的增强作用,铽:钇为0.7:0.3的配合物(Tb0.7Y0.3)(HL)L′Cl.1/2H2O的发光强度最大。

By replacing a part of terbium ions with yttrium ions using doping method,a series of dinuclear complexes of 1,3,5-benzene tricarboxylic acid（H3BTC） and phenanthroline（phen） with different molar ratios of Tb3＋ to Y3＋ were synthesized in the present paper.Their elemental analysis,rare earth complexometric titration,molar conductivity,IR spectra and UV spectra were studied,and the contents of terbium and yttrium of three doped complexes were measured by a plasma emission spectrophotometer.Their chemical formula is inferred to be（TbxY1-x）（HL）L′Cl·1/2H2O（x=0.10,0.30,0.50,0.70,0.90,L=BTC3-,L′=phen）.The infrared spectra and ultraviolet spectra were determined,the results showed that the rare earth ions are bounded with the oxygen atoms of trimesic acid,and with the nitrogen atoms of phenanthroline.The fluorescence spectra of the complexes were determined at the room temperature（the exit and entrance slits are both 1.5 nm）.The fluorescence intensity of terbium doped yttrium complexes is stronger than those of the terbium complex;it was showed that the fluorescence intensity of Tb3＋ ion is greatly enhanced by Y3＋ ion in the complexes.The fluorescence intensity of（Tb0.7Y0.3）（HL）L′Cl·1/2H2O complex is the strongest among the six complexes.The lowest excitation state energy level of Tb3＋ ion and the triplet state energy level of the ligands（H3BTC and phen） match well each other,and the absorbing energy of the ligands is effectively transferred to Tb3＋ ion.