镝与二甘醇酸的配位聚合物的水热合成、晶体结构及荧光性质

DyCl₃·6H₂O与二甘醇酸(H₂dga)在水热条件下反应得到配位聚合物{Dy₂(dga)₃(H₂O)₄]·2H₂O}_n，用X-射线衍射单晶结构分析方法确定了其晶体结构。该配合物的晶体属于正交晶系，C222₁空间群。在配合物中，Dy³⁺离子存在两种类型的配位环境。九配位的Dy1离子与3个二甘醇酸根的6个羧基氧原子和3个醚氧原子配位，其配位多面体可描述为一个扭曲的单帽四方反棱柱;八配位的Dy2离子周围的8个配位氧原子形成一个扭曲的四方反棱柱配位多面体，其中4个氧原子来自4个二甘醇酸根，另外4个氧原子由4个配位水分子提供。二甘醇酸配体的2个羧基和其醚氧原子同时与Dy³⁺离子配位而形成2D网状结构。 该配合物在室温下的固体荧光光谱显示了中心Dy³⁺离子的特征荧光，位于483 nm和574 nm的发射峰分别对应于Dy³⁺离子的 ⁴F_9/2 → ⁶H_15/2和 ⁴F_9/2 → ⁶H_13/2跃迁。

Hydrothermal Synthesis, Crystal Structure and Fluorescence Property of Dysprosium Coordination Polymer with Diglycolic Acid

A new lanthanide coordination polymer {Dy2(dga)3(H2O)4]·2H2O}n was prepared by hydrothermal method with DyCl3·6H2O and diglycolic acid (H2dga), and structurally characterized by single-crystal X-ray diffraction technique. The complex crystallizes in Orthorhombic system, C2221 space group with a=1.773 5(11) nm, b =0.875 2(6) nm, c=1.504 3(9) nm, V=2.335 0(3) nm3, Dc=2.359 Mg·m-3, Z=4,μ=6.447 mm-1, F(000)=1 584.0, R=0.0507, wR=0.121 6. In the complex, there are two types of coordination environments for Dy3+ ion. One Dy1 ion is nine-coordinated by three diglycolato groups via six carboxyl oxygen atoms and three ether oxygen atoms. The Dy1 ion is in a distorted monocapped square-antiprism coordination geometry. Whereas the other Dy2 ion is eight-coordinated and the coordination sphere around each Dy2 ion consists of four carboxyl oxygen atoms from four diglycolato ligands and four oxygen atoms from four coordinated water molecules. The coordination polyhedron of Dy2 ion can be described as a distorted square-antiprism. Eight- and nine-coordinate Dy3+ ions are linked by diglycolato ligands to form a 2D network structure. The fluorescence spectral of the complex in solid state at room temperature shows that the diglycolic acid is suitable for the sensitization on the luminescence of Dy3+ ion. CCDC: 660435.