Two Carboxylato-bridged Binuclear Cobalt(Ⅱ) Complexes Pillared Coligands: Synthesis, Structures and Magnetic Properties  

作　　者：XIN Ling-Yun LI Xiao-Ling YIN Wei-Dong LIU Guang-Zhen 辛凌云;李晓玲;尹卫东;刘广臻(College of Chemistry and Chemical Engineering,and Henan Key Laboratory of Function-oriented Porous Materials,Luoyang Normal University,Luoyang,Henan 471934,China;School of Food and Drug,Luoyang Normal University,Luoyang,Henan 471934,China)

机构地区：[1]College of Chemistry and Chemical Engineering,and Henan Key Laboratory of Function-oriented Porous Materials,Luoyang Normal University,Luoyang,Henan 471934,China [2]School of Food and Drug,Luoyang Normal University,Luoyang,Henan 471934,China

出　　处：《Chinese Journal of Structural Chemistry》2020年第5期933-941,共9页结构化学（英文）

基　　金：supported by the National Natural Science Foundation of China(No.21571093);Colleges and Universities Key Scientific Research Project of Henan Province(No.18B150016)。

摘　　要：By adopting mixed-ligand strategy,two Co(Ⅱ)coordination polymers,[Co(phda)(itmb)(H2O)2]n(1)and[Co(phda)(Hpytz)]n(2)(H2phda=1,2-phenylenediacetate,itmb=1-(imidazo-1-ly)-4-(1,2,4-triazol-1-yl methyl)benzene and Hpytz=3,5-di(4-pyridyl)-1,2,4-triazolate),were hydrothermally synthesized and then characterized by elemental analysis,IR spectroscopy,thermogravimetric analysis(TGA),powder X-ray diffraction(PXRD)and single-crystal X-ray diffraction.The single-crystal X-ray diffraction reveals that two complexes feature carboxylato-bridged binuclear subunits extended further by the nitrogen-rich coligands to form different structures.Complex 1 containing phda-bridged binuclear cobalt is developed by itmb coligand to 1D double-stranded chain,whereas complex 2 exhibits 2D open bilayers,which result from the ribbon-like carboxylate chains pillared Hpytz coligands.In addition,the magnetic susceptibilities of both compounds were measured over the temperature range of 3~300 K,and the data were analyzed well using Mag Saki software.The best fitting parameters wereκ=0.98,λ=-100 cm-1,?=588 cm-1 and J=0.6 cm-1 for complex 1 andκ=0.86,λ=-110 cm-1,?=756.8 cm-1 and J=-1.25 cm-1 for complex 2.The results indicate the existence of weaker ferromagnetic interaction for complex 1 and antiferromagnetic interaction for complex 2 between the metal centers in the dinuclear metal units.

关 键 词：MIXED-LIGAND COMPLEXES SYNTHESIS STRUCTURES magnetic properties 

分 类 号：O641.4[理学—物理化学]