三种Er(Ⅲ)配合物的合成、晶体结构及光物理研究

Three Er(Ⅲ) Coordination Polymers:Synthesis,Crystal Structures and Photophysical Properties

分别以均苯四甲酸,对硝基苯甲酸,肉桂酸为配体,采用水热合成方法,得到了3种Er(Ⅲ)配位聚合物:{[Er2(btec)1.5(H2O)4].2H2O}n(1),[Er4(NO2-C6H4COO)12(H2O)10].2H2O(2),[Er(C9H7O2)3]n(3)。通过X-光单晶衍射确定了它们的结构。结构分析表明,配合物1是1个具有三维结构的配位聚合物,其构筑单元为{[Er2(btec)1.5(H2O)4].2H2O},每个结构单元中含有4个Er3+离子,它们属于2种晶体学类型,以及3个配位方式不同的均苯四甲酸根。配合物2是1个四核配合物,在同1个分子中,含有4个Er3+离子,它们也属于2种晶体学类型,在2的晶体中存在大量的氢键。配合物3是1个一维配位聚合物。实验测定了各配合物晶体粉末的FP,IR,UV-Vis-NIR等光谱,对光谱进行了分析指认,对比了3个配合物的近红外发光。

Three Er（Ⅲ） coordination complexes： {[Er2（htec）l.5（H2O）4]· 2H2O}, （1）, [Er4（NO2-C6H4COO）12（H20）m]· 2H2O （2）, [Er（C9H7O2）3]n （3） have been synthesized with the 1,2,4,5-benzenetetracarboxylic acid, p-nitro benzoic acid and cinnamate as the ligand by the hydrothermal method. The structures were determined by single-crystal X-ray diffraction. Structure analysis indicates that the complex 1 is a 3D structural polymer with the constructed unit of {[Er2（btec）1.5（H2O）4]· 2H2O}, in which four Er3＋ belong to two kinds of crystallographic types. There are three different coordination fashions of benzenetetracarboxylic acid radical in the unit of molecule. The complex 2 is a four nuclear molecule. There are four Er3＋ ions in the same molecule, which belong to two kinds of crystallographic types. A lot of hydrogen bonds were formed in the crystal of complex 2. The complex 3 is a 1D coordination polymer. The fluoreseence spectra, IR, and UV-Vis-NIR of the complexes were measured and analyzed. The NIR luminescence of three coordination polymers were compared. CCDC： 826590, 1; 826591, 2; 826952, 3.