Du Yan, Zhao Yong-Liang, Fu Xiao-Tao, Sun Hui-Juan, Li Xin
College of Chemistry and Chemical Engineering, Inner Mongolia University, Huhhot 010021, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 Jan;31(1):158-61.
Two terbium complexes were synthesized, with dibenzoylmethane (HDBM) as the first ligand and 1,10-phenanthroline (phen), dipyrido[3,2-a:2',3'-c] quinoxaline as the second ligand. The studies of elemental analysis, rare earth complexometric titration, molar conduction, IR spectra, UV spectra, fluorescence excitation and emission spectra indicate that the complexes have the compositions of Tb (DBM)3 phen and Tb (DBM)3dpq. The results show that the rare earth ion (Tb3+) was bonded with the carbonyl oxygen atom of DBM and nitrogen atoms of phen and dpq. For the terbium complexes prepared by precipitation, the peak positions of the transitions were similar with the ones of the common complexes. The peaks at 490, 545, 586 and 621 nm were assigned to the D4 --> 7F6, 5D4 --> 7F6, D4 --> 7F6, 5D4 --> 7F6 transitions. For the fluorescence intensities of their 5D4 --> 7F6, 5D4 --> 7F5 and 5D4 --> 7F4 transitions were lower than that of the 5D4 --> 7F3 transition, the terbium complexes did not exhibit the characteristic fluorescence (green), but strong red fluorescence. The reason why terbium complexes exhibit the red fluorescence was investigated in the paper by studying the triplet state of ligands, the energy level transitions of complexes and the aggregation state of particles.
合成了两种铽配合物，以二苯甲酰甲烷（HDBM）作为第一配体，1,10 - 菲咯啉（phen）、二吡啶并[3,2 - a:2',3'- c]喹喔啉作为第二配体。元素分析、稀土络合滴定、摩尔电导率、红外光谱、紫外光谱、荧光激发和发射光谱研究表明，配合物的组成为Tb(DBM)₃phen和Tb(DBM)₃dpq。结果表明，稀土离子（Tb³⁺）与DBM的羰基氧原子以及phen和dpq的氮原子键合。对于通过沉淀法制备的铽配合物，其跃迁的峰位与常见配合物的峰位相似。490、545、586和621 nm处的峰分别归属于⁵D₄→⁷F₆、⁵D₄→⁷F₆、⁵D₄→⁷F₆、⁵D₄→⁷F₆跃迁。由于它们的⁵D₄→⁷F₆、⁵D₄→⁷F₅和⁵D₄→⁷F₄跃迁的荧光强度低于⁵D₄→⁷F₃跃迁的荧光强度，铽配合物未表现出特征荧光（绿色），而是呈现出强红色荧光。本文通过研究配体的三重态、配合物的能级跃迁以及颗粒的聚集状态，对铽配合物呈现红色荧光的原因进行了研究。
