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在水热条件下,利用硫代羟基二乙酸配体[thiodiglycolic acid=H2tda]和TbCl3·nH2O合成了新型稀土配合物[Tb2(tda)3(H2O)2]。单晶结构表明,配合物是以共边多面体[Tb2O16]为基本单元构筑的二维结构,并通过弱相互作用拓展为三维超分子体系。中心原子铽与氧原子的配位数是8和9,分别形成了单帽反四棱柱和三帽三角棱柱构型的空间配位多面体。配体H2tda在配合物中存在两种配位模式:(a)双“顺-顺桥式双齿、螯合桥式三齿”模式和(b)双“螯合双齿、顺-反桥式双齿”模式。荧光光谱研究表明:该配合物在室温下呈现较强的绿色荧光发射。配合物属三斜晶系,空间群P1。
A novel rare earth complex [Tb2 (tda) 3 (H2O) 2] has been synthesized by thiodiglycolic acid = H2tda and TbCl3 · nH2O under hydrothermal conditions. The single crystal structure shows that the complex is a two-dimensional structure based on the co-polyhedron [Tb2O16] and expands to a three-dimensional supramolecular system through weak interaction. The coordination number of terbium with oxygen atoms is 8 and 9, respectively, which form the spatially coordinated polyhedron of single-capped and four-capped triangular prism, respectively. The ligand H2tda has two coordination modes in the complex: (a) double “cis-trans-bridge bidentate, chelation bridge tridentate” and (b) double “chelate bidentate - Anti-Bridge Double Tooth ”mode. Fluorescence spectroscopy studies show that the complex exhibits strong green fluorescence emission at room temperature. Complex is triclinic, space group P1.