以5-甲基-3-吡唑甲酸为配体的锰和钴的配合物的合成、晶体结构和磁性(英文)

Syntheses, Crystal Structures and Magnetic Property of Manganese and Cobalt Complexes Based on 5-Methyl-1H-pyrazole-3-carboxylic Acid Ligand

以5-甲基-3-吡唑甲酸为配体,合成了1个单核锰（Ⅱ）配合物[Mn（HMPCA）2（phen）]·2H2O（1）和1个钴（Ⅱ）的一维配位聚合物{[Co（HMPCA）2（pyz）]·5H2O}n（2）（H2MPCA=5-甲基-3-吡唑甲酸;phen=1,10-菲咯啉;pyz=吡嗪）,并用元素分析、红外光谱、X-射线单晶衍射结构分析、热重分析等对其进行了表征。配合物1属于正交晶系,空间群为Pbca,配合物2属于单斜晶系,空间群为P21/c。配合物1和2中的金属离子都位于1个畸变的八面体构型中。配合物1中的独立结构单元间通过分子间氢键作用构成1个三维结构。而在2中,每个吡嗪分子桥联2个相邻的钴（Ⅱ）离子,形成1个一维链;这些一维链和水分子通过分子间氢键进一步形成一个三维的结构。变温磁化率数据（300~1.8K）表明配合物2中的钴（Ⅱ）离子间存在弱的反铁磁性作用。

One monomeric complex [Mn（HMPCA）2（phen）]·2H2O（1） and one 1D coordination polymer {[Co（HMPCA）2（pyz）]·5H2O}n（2）（pyz =pyrazine, H2 MPCA =5-methyl-1H-pyrazole-3-carboxylic acid, phen =1,10-phenanthroline） have been synthesized and characterized by elemental analysis, IR spectra, single crystal X-ray diffraction, thermogravimetric analysis. Complex 1 crystallizes in the orthorhombic system, space group Pbca,while 2 in the monoclinic system, space group P21/c. In 1, Mn（Ⅱ） ion is located in a octahedral coordination geometry, discrete mononucleate units and water molecules are assembled into a 3D network. In 2, each cobalt ion is coordinated by two nitrogen atoms from two pyz molecules, two nitrogen atoms and two oxygen atoms from two HMPCA-ligands, forming a slightly distorted octahedral geometry. Each pyz ligand bridges two adjacent Co（Ⅱ）ions, forming a 1D chain. These chains and water molecules are connected by hydrogen bonds, forming a 3D supramolecular network. Magnetic susceptibility data of 2 from 300 ~1.8 K show that there is a weak antiferromagnetic exchange between Co（Ⅱ） ions. CCDC： 1001405, 1; CCDC： 998994, 2.