Synthesis, crystal structures and magnetic properties of Pyrazole-Carboxylic acid complexes

Three new complexes, {[Ni 2 (3-PCA) (DMAP) 4 (H O) ]·2H O} , [Cu (4-PP) ·2H O] n and (4-PCA) (2,2′-bpy) are synthesized by the solvothermal method with pyrazole-3-carboxylic acid or pyrazole-4-carboxylic as main ligands 2,2′-bipyridine, 4-dimethylaminopyridine, 4-phenylpyridine auxiliary ligands. The crystal structures of three complexes determined single-crystal X-ray diffraction, powder thermogravimetric analysis, Fourier transform infrared analysis. magnetic detection proves that all antiferromagnetic.