基于柔性芳香羧酸配体的三维镉(Ⅱ)配位聚合物的合成、晶体结构及荧光性质

Synthesis,Crystal Structure and Fluorescence Properties of 3D Cadmium(Ⅱ) Coordination Polymer Based on Flexible Aromatic Carboxylic Acid Ligand

以Cd(NO3)2·4H2O和5-(4'-羧基苯氧基)烟酸(H2L)为原料,用水-DMF溶剂热合成法合成了一个新型三维配位聚合物[Cd(L)(H2O)2]n,并采用红外光谱、元素分析、热重分析和X射线粉末衍射对其进行了表征。晶体结构由X射线单晶衍射仪分析确定,该配合物属于单斜晶系,P21/n空间群,晶胞参数为a=0.6201(2)nm,b=0.8225(3)nm,c=2.6361(10)nm,α=90.00°,β=90.101(7)°,γ=90.00°,V=1.3444(9)nm3,Z=4。在该配合物中,每个Cd(II)的配位环境为六配位的八面体构型,金属Cd(II)通过配体离子L2-连接形成一个三维的框架结构。室温固态荧光测试结果表明,该配合物具有一定的荧光性。

A novel 3D coordination polymer [Cd（L）（H2O）2]nwas synthesized by the reaction of Cd（NO3）2· 4H2O with 5-（4 ’-carboxyl phenoxy） nicotinic acid through solvothermal method and structurally characterized by elemental analysis,FT-IR spectra,thermal analysis and X-ray powder diffraction analysis. Single-crystal X-ray diffraction analysis reveals that the coordination polymer crystallizes in monoclinic system,space group P21/ n with a = 0. 6201（2） nm,b = 0. 8225（3） nm,c = 2. 6361（10） nm,α = 90. 00°,β = 90. 101（7） °,γ = 90. 00°,V = 1. 3444（9） nm3,Z = 4. In the coordination polymer,each Cd（II） ion is six-coordinated and located at the center of a distorted octahedron; the interconnection of Cd（II） ions through L2-results in a 3D framework.