一种新的铽发光配合物的合成、晶体结构及表征

Synthesis, Crystal Structure and Characterization of a Novel Terbium Fluorescent Coordination Polymer

摘要:

在水热合成条件下合成一个新的吡啶-3,5-二羧酸的稀土铽配合物[Tb2(pydc-3,5)3(H2O)9]n3nH2O，通过X射线单晶衍射、元素分析和红外等手段的表征确定该化合物的组成和晶体结构。结果表明，吡啶-3,5-二羧酸(pydc-3,5)配体与稀土金属Tb形成了一维链状配位聚合物，中心稀土金属有两种配位形式，每个金属均与氧原子形成九配位的结构。配体中的羧酸根采用两种配位方式，即单齿配位和双齿配位。同时配合物能发出三价铽离子的特征绿色荧光，荧光光谱的研究表明，配合物表现出很好的荧光性能。

Abstract:

Rare-earth metal-organic frameworks, [Tb2(pydc-3,5)3(H2O)9]n3nH2O, was synthesized under a hydrothermal condition. Then the composition and the crystal structure of the compound were determined by single-crystal X-ray diffraction, element analysis and IR spectra. Results show that pyridine-3,5-dicarboxylic acid (pydc-3,5) ligand and Tb element form one-dimensional chain-like coordination polymer. Here the central rare-earth metal Tb has two typical coordination environments and each metal atom is nine-coordinated with oxygen atoms. The carboxylate groups of pydc-3,5 ligand provide two kinds of coordination ways as didentate and monodentate. The terbium complex can emit characteristic green fluorescence of Tb3+ and the solid-state photoluminescence spectra show that the complex has excellent fluorescence property.