二连接芳香酰胺配体桥联稀土一维配位聚合物的合成与表征

Synthesis and Characterization of 1D Coordination Polymers of Rare Earth Ions Bridged by Dual-link Aryl Amide Type Ligand

制备了二连接酰胺配体L{L=1,4-双[(2′-苄胺甲酰基苯氧基)-甲基]苯}的稀土Pr3+、Eu3+和Tb3+的配合物,测定了Pr3+配合物的单晶结构,同时还对Eu3+和Tb3+配合物的荧光性质进行研究。X-射线单晶衍射测定结果表明,荧光配体采用双-单齿桥联配位特征与稀土Pr3+离子形成环链相间的一维聚合物{[Pr(NO3)3]2.L3}n。配合物属三斜晶系,PI空间群,稀土离子与来自三个配体的羰基氧和三个双齿硝酸根配位,总配位数为9,形成变形的三帽三角棱柱构型的配位多面体。荧光测试结果表明,芳香羧酸经酰胺化后依然能保持对稀土Eu3+、Tb3+离子的敏化发光性能,而配合物的溶解性与水杨酸配合物相比则得到明显改善。

A dual-link aryl amide type ligand L（L=1,4-bis[（2′-formyl-phenyl benzy Prmine oxy）-methyl] benzene） and its rare earth complexes（Ln^（3＋）=Pr^（3＋）,Eu^（3＋） and Tb^（3＋）） were prepared.The structure of the complex of Pr^（3＋） was determined,and the luminescence properties of the complexes of Eu^（3＋） and Tb^（3＋） were studied.X-ray single-crystal diffraction results show that the ligands take bis-monodentate bridging coordination mode to form 1D rings connected by chains coordination polymer {[Pr（NO_3）_3]·L_3}_n.The crystal structure belongs to triclinic system with space group P_I.Each Pr^（3＋） is nine-coordinated with three carbonyl oxygen atoms of three ligands and six oxygen atoms of three bi-dentate nitrates.The coordination polyhedron is in the form of distorted tricapped trigonal prism.The properties to sensitize Eu^（3＋） and Tb^（3＋） to give luminescence of the ligands were maintained after the amidation of aromatic carboxyl groups,and the solubility of the complexes,comparing with the complexes of salicylic acid,was improved obviously.