基于混合配体的两个同构配合物的晶体结构和磁性研究  

Crystal Structure and Magnetism of Two Isomorphic Complexes Based on Mixed Ligands

作　　者：李佳 冯婧[1] 苗萌 LI Jia;FENG Jing;MIAO Meng(Shanghai University of Medicine&Health Sciences,Shanghai 201318,China)

机构地区：[1]上海健康医学院,上海201318

出　　处：《人工晶体学报》2025年第4期693-699,共7页Journal of Synthetic Crystals

基　　金：上海健康医学院师资人才百人库产学研践习项目(A3-0200-24-311007)。

摘　　要：本文以3,6-二-2-吡啶基-1,2,4,5-四嗪(DPTZ)和4,4′-氧化二苯甲酸(H_(2)OBA)作为双配体,分别与Co(Ⅱ)离子和Cd(Ⅱ)离子在溶剂热条件下反应,得到配合物[Co(OBA)(DPTZ)]·(DMF)_(0.5)(1)、[Cd(OBA)(DPTZ)]·(DMF)_(1.5)(2)。通过单晶X射线衍射、X射线粉末衍射、元素分析和热重分析等方法对配合物的结构进行了表征和分析,晶体结构分析表明配合物1和2同构,都属于单斜晶系,空间群为P2_(1)/c,每个不对称单元由1个金属离子(Co/Cd)、1个3,6-二-2-吡啶基-1,2,4,5-四嗪配体和1个4,4′-氧化二苯甲酸配体组成。每个中心金属离子(Co/Cd)具有扭曲的八面体构型,两个相邻的金属离子(Co/Cd)与羧酸配体连接,形成双核风车次级结构单元。双核风车次级结构单元与OBA配体和DPTZ配体连接构成了具有无限延展的波浪形二维层状结构。由于V型配体OBA作为柔性配体的引入,结构中形成了左手和右手的螺旋链及螺旋孔道。磁性研究结果表明,配合物1中存在反铁磁相互作用。3,6-di(2-pyridyl)-1,2,4,5-tetrazine(DPTZ)and 4,4′-oxybisbenzoic acid(H_(2)OBA)were used as mixed ligands to react with Co(Ⅱ)ions and Cd(Ⅱ)ions under solvothermal conditions,resulting in the formation of the complexes[Co(OBA)(DPTZ)]·(DMF)_(0.5)(1)and[Cd(OBA)(DPTZ)]·(DMF)_(1.5)(2).The structural characterization and analysis of the complexes were conducted through single-crystal X-ray diffraction,powder X-ray diffraction,elemental analysis,and thermogravimetric analysis.Crystallographic data reveals that complexes 1 and 2 are isostructural,belonging to the monoclinic system with the space group of P2_(1)/c with each asymmetric unit consisting of one metal ion(Co/Cd),one 3,6-di(2-pyridyl)-1,2,4,5-tetrazine ligand and one 4,4′-oxybisbenzoic acid ligand.The central metal ion(Co/Cd)has a distorted octahedral configuration,and two adjacent metal ions(Co/Cd)are connected by carboxylic acid ligands,forming a dinuclear pinwheel secondary structural unit.The dinuclear pinwheel secondary structural units are connected by OBA and DPTZ ligands,resulting in an infinitely extended 2D wave-like layer.The existence of the V-shaped ligand OBA as a flexible component within the structure gives rise to both left-handed and right-handed helical chains and helical channels.Furthermore,the magnetic measurement result shows that intramolecular antiferromagnetic interaction is observed in complex 1.

关 键 词：Co(Ⅱ)配合物 Cd(Ⅱ)配合物 混合配体 溶剂热法 晶体结构 磁性 螺旋链 

分 类 号：O641.4[理学—物理化学]