Synthesis,Structure and Magnetic of Metal Co Complex with Carboxylic Acid Ligand
Carboxylic acid ligand complexes have potential applications in many fields such as gas ad-sorption/separation,catalysis,optics and magnetism.Two carboxylic acids,5-aminoisophthalic acid and pyrazinecarboxylic acid,were used as ligands to react with cobalt chloride under solvothermal con-ditions to prepare two novel cobalt complexes{[Co2(μ3-OH-)2(5-HAIPC)(2-PC)]}n(1)and{[Co2Cl2(2-PC)2(H2O)3]}n(2).The structures of complexes 1 and 2 were characterized by X-ray single crystal diffraction,infrared spectroscopy and thermogravimetric analysis.The X-ray single crys-tal diffraction results show that the complex 1 belongs to the C2/c space group,and the chair-type tet-ranuclear cluster is connected by 5-aminoisophthalic acid and pyrazinecarboxylic acid to form a three-dimensional framework.Complex 2 belongs to P21/C space group.The ligand pyrazine formic acid is connected with the metal center Co2 to form an infinitely extended one-dimensional chain.The ligand pyrazine formic acid is connected with Co1 to form a two-dimensional layered structure.The metal cen-ter Co1 and Co2 are connected by ligands and then assembled into a three-dimensional supramolecular structure by hydrogen bonding.The magnetic properties of the two complexes were tested,and the re-sults show that both complexes 1 and 2 were antiferromagnetic.
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