两个基于2,2′-联吡啶-3,3′-二羧酸的稀土配合物的晶体结构和荧光性质(英文)

Synthesis, Structure, Properties of Two Rare Earth Complexes Based on2,2′-Bipyridine-3,3′-dicarboxylic Acid

采用水热法合成了2个具有二维结构的吡啶羧酸类稀土配位聚合物{[Ln2(bpdc)3(H2O)2]·5H2O}n,(Ln=Nd(1),Eu(2);bpdc=2,2′-Bipyridyl-3,3′-dicarboxylic acid)。单晶衍射分析显示1、2结构相似,均属于单斜晶系,P2/c空间群。1、2的晶胞参数分别为a=1.241 00(19)nm,b=0.748 35(59)nm,c=2.060 50(20)nm,β=94.84(1)°;a=1.241 00(19)nm,b=0.743 01(20)nm,c=2.052 50(30)nm,β=94.95(2)°。配合物是由之字形一维链构成的二维网络结构,其拓扑符号为{3^9;4^18;5}。热重测试结果表明1、2热稳定性较好。配合物2显示出很好的荧光性能。

Two rare earth coordination polymers {[Ln2 （bpdc）3 （H2O）2]· 5H2O}n, （Ln=Nd （1）, Eu （2）; bpdc=2,2＇- Bipyridyl-3,3＇-dicarboxylic acid） were hydrothermally synthesized. Single-crystal X-ray diffraction shows that 1 and 2 are isomorphic and in the monoclinic system with P2/c group. Crystal unit parameters are a=1.241 00（19） nm,b=0.748 35（59） nm,c=2.060 50（20） nm,β=94.84（1）° and a=1.241 00（19） nm,b=0.743 0l（20） nm,c=2.052 50 （30） nm,β=94.95（2）° respectively. In addition, the complexes afforded a two-dimensional （2D） structure based on the zigzag chains （1D） linked by bpdc ligands and appear 8-coordinated single network structure with topology symbol {3~9;4^18;5} as well. Interestingly, pentameric water rings were founded between lattice water molecules in 1 and 2. Thermo-gravimetric analyses of 1 and 2 display considerable thermal stability. The complex 2 displays good fluorescence property. CCDC： 925994, 1; 925995, 2.