基于混合配体的两个同构配合物的晶体结构和磁性研究

doi:10.16553/j.cnki.issn1000-985x.2024.0244

摘要/Abstract

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(H₂OBA)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P2₁/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。

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

Abstract: 3,6-di(2-pyridyl)-1,2,4,5-tetrazine (DPTZ) and 4,4’-oxybisbenzoic acid (H₂OBA) 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 P2₁/c with each asymmetric unit consisting of onemetal 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.

Key words: Co(II) complex, Cd(II) complex, mixed ligand, solvothermal, crystal structure, magnetism, helical chain

中图分类号:

O641.4

李佳, 冯婧, 苗萌. 基于混合配体的两个同构配合物的晶体结构和磁性研究[J]. 人工晶体学报, 2025, 54(4): 693-699.

LI Jia, FENG Jing, MIAO Meng. Crystal Structure and Magnetism of Two Isomorphic Complexes Based on Mixed Ligands[J]. Journal of Synthetic Crystals, 2025, 54(4): 693-699.

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