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

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