系列双核稀土配合物的合成、晶体结构及光物理性质

Synthesis, Crystal Structure and Photophysical Property of Series of Binuclear Rare Earth Complexes

本文采用水热法合成了4种双核稀土配合物[Y2(p-MBA)6(Phen)2](1)、[Y2(p-ClBA)6(Phen)2](2)、[Pr2(BA)6(Phen)2](3)和[Pr2(p-ClBA)6(H2O)2(Phen)2](4)[Phen=邻菲咯啉、p-MBA=对甲基苯甲酸、BA=苯甲酸、p-ClBA=对氯苯甲酸]。测定了4种配合物的单晶结构。4种配合物在结构和配位方式上有很多的相似之处,它们的晶体都属于三斜晶系,P1空间群。在分子中,每个稀土离子与1个邻菲咯啉分子螯合,2个稀土离子均以苯甲酸根或其衍生物为桥。但是,桥连配体的数目以及配体的配位方式不尽相同。配合物4中配位水分子与对氯苯甲酸根之间形成了氢键,氢键将双核配合物4连接成二维层状网络结构。对4种配合物的UV-Vis-NIR、IR和荧光性质进行了测定和对比分析。配合物1和2的荧光指认为LLCT和LMCT,而配合物3和4的荧光表现出LLCT与LMCT混合跃迁及Pr3+的特征发射。

Four binuclear rare earth complexes [Y2（p-MBA）6（Phen）2] （1）, [Y2（p-ClBA）6（Phen）2] （2）, [Pr2（BA）6（Phen）2] （3） and [Pr2（p-ClBA）6（H2O）：（Phen）2] （4） [Phen=o-Phenanthroline, p-MBA=4-Methylbenzoic acid, BA=Benzoic acid, p-ClBA =p-Chlorobenzoic acid] were synthesized with hydrothermal reaction. The structures of four complexes were determined by X-ray diffraction single crystal structure analyses. Four complexes are similar in the structure and coordination modes. For example, their structures all belong to the triclinic system, space group P1. Each rare earth ion is chelated by a Phen molecule, two rare earth ions are bridged by benzoic acid ligands or their derivatives in complex molecules. But, it is different in the number of bridged ligands and coordination modes. Besides that, in complex 4, hydrogen bonds are formed between coordinated water molecules and p-ClBA ligands, and the 2D layer net structure is formed by the hydrogen bonds. In addition, the UV-Vis-NIR, IR and fluorescence spectra of four complexes were measured and analyzed. Fluorescence spectra of complex 1 and 2 are assigned to LLCT and LMCT. The emissions of complex 3 and 4 have a mixed LMCT and LLCT character and a ffCT character of Pr^3＋. CCDC： 680944, 1; 680945, 2; 680946, 3; 680947, 4.