Complexes of Copper(II) and Cobalt(II) Halides with 4-(3,5-Dimethyl-1H-Pyrazol-1-yl)-6-Methyl-2-Phenylpyrimidine: Synthesis, Structures, and Properties

摘要

Copper(II) and cobalt(II) complexes with 4-(3,5-dimethyl-1H-pyrazol-1-yl)-6-methyl-2-phenylpyri-midine (L) of the general formula MLX2 (M = Cu(II), X = Cl and Br; M = Co(II), X = Cl, Br, and I) were obtained. According to X-ray diffraction data, CuLBr2 and CoLX2 (X = Cl, Br, and I) are mononuclear molecular complexes. The ligand L is coordinated to the metal atom in a chelating bidentate fashion through the N atoms of the pyrimidine and pyrazole rings. The coordination polyhedron of the metal atom is extended to a distorted tetrahedron by two halide ions. In solution, CuLBr2 undergoes slow transformation into CuL_((1-x))L'_xBr2 and the binuclear (X-ray diffraction data) Cu(I) complex [CuL_((1_x))L'_xBr]2 (L' is 4-(4-bromo-3,5-dimethyl-1H-pyrazol-1-yl)-6-methyl-2-phenylpyrimidine). The complexes MLX2 show weak antiferromagnetic interactions between the M~(2+) ions.