The Synthersyse And Properties Of Functional Complexes Based On Pyrazine-2-carboxylato

The rational arrangement of spin carriers in the solid state with desired propetries bybridging ligands is an effective way to contribute the new molecule-based magnetic materials.Pyrazine carboxylic acid is an organic ligand, which can coordinate to several metal ions andmay exhibit various coordination modes. Thus it is a good candidate for synthesizing novelcomplexes. In this paper, we use the pyrazine-2-carboxylic acid to synthesis a series of metalcoordination complexes with the CoⅡand GdⅢions, and study its structure and magneticproperties as follows:1、the complex2-A and2-B systhesis by Pyrazine-2-carboxylic acid and CoCl2·6H2O. Inthe complex2-A, the CoIIion is coordinated by one inorganic chloride anion three oxygenatoms, two nitrogen atoms form three pzc and the way every CoII connected to three pzcligands and every pzc ligands links three metal ions resulting two dimensional (2D) layer. Inthe complex2-B, Co1is coordinated by two chloride anion and four nitrogen from four pzcanions, Co2is coordinated by four pzc ligands in which two pzc anions take chelating modeand an elongate octahedral cage linked by Co1ions giving1D chains, the1D chains shareCo2ions in forming a3D structure with water molecules filed in the channels of the cages.The complexes2-A、2-B are unstable because of the methanol molecule and chloride anionparticipate in the coordination.2、The complex3-A systhesis by pyrazine-2-carboxylic acid and azide with CoⅡand GdⅢions. Both CoⅡand GdⅢions coordinated with pyrazine-2-carboxylic acid and azide, theposition of Co2ions were accounted by1/3Na ions and2/3Co2ions, constructing a2D net.Magnetic study indicated that3-A had ferromagnetic interations.