In situ synthesis,crystal structure,and magnetic characterization of a trinuclear copper complex based on a multi-substituted imidazo[1,5-a]pyrazine scaffold  

基于多取代咪唑并[1,5-a]吡嗪骨架的三核铜配合物的原位合成、晶体结构及磁性表征

作　　者：WANG Zhaodong 王召东(重庆文理学院化学与环境工程学院,重金属废水资源利用重庆市重点实验室,重庆402160)

机构地区：[1]College of Chemistry and Environmental Engineering,Chongqing Key Laboratory for Resource Utilization of Heavy Metal Wastewater,Chongqing University of Arts and Sciences,Chongqing 402160,China

出　　处：《无机化学学报》2025年第3期597-604,共8页Chinese Journal of Inorganic Chemistry

摘　　要：A trinuclear copper complex [Cu_(3)(L2)_(2)(SO_(4))_(2)(H_(2)O)_(7)]·8H_(2)O(1)(HL2=1-hydroxy-3-(pyrazin-2-yl)-N-(pyrazin-2-ylmethyl)imidazo[1,5-a]pyrazine-8-carboxamide) with a multi-substituted imidazo[1,5-a]pyrazine scaffold was serendipitously prepared from the reaction of the pro-ligand of H_(2)L1(N,N'-bis(pyrazin-2-ylmethyl)pyrazine-2,3-dicarboxamide) with CuSO_(4)·5H_(2O) in aqueous solution at room temperature.Complex 1 was characterized by IR,single-crystal X-ray analysis,and magnetic susceptibility measurements.Single-crystal X-ray analysis reveals that the complex consists of three Cu(Ⅱ) ions,two in situ transformed L2~-ligands,two coordinated sulfates,seven coordinated water molecules,and eight uncoordinated water molecules.Magnetic susceptibility measurement indicates that there are obvious ferromagnetic coupling interactions between the adjacent Cu(Ⅱ) ions in 1.CCDC:1852713.以前驱配体N,N'-双(吡嗪-2-基甲基)吡嗪-2,3-二甲酰胺(H_(2)L1)与CuSO_(4)·5H_(2)O在室温水溶液中反应,意外制备了具有多取代咪唑并[1,5-a]吡嗪骨架的三核铜配合物[Cu_(3)(L2)_(2)(SO4)_(2)(H_(2)O)_(7)]·8H_(2)O(1),其中HL2=1-羟基-3-(吡嗪-2-基)-N-(吡嗪2-基甲基)咪唑并[1,5-a]吡嗪-8-甲酰胺。通过红外光谱、单晶X射线衍射分析及变温磁化率测定对配合物进行了表征。单晶X射线衍射分析表明,该配合物由3个Cu(Ⅱ)、2个原位生成的HL2配体、2个参与配位的SO_(4)^(2-)、7个参与配位的H_(2)O以及8个未参与配位的H_(2)O构成。变温磁化率测试表明1的相邻铜离子间存在铁磁耦合作用。

关 键 词：amide ligand copper complex single crystal structure C-N coupling magnetic characterization 

分 类 号：O614.121[理学—无机化学]