Dichlorido(3,5,5′-trimethyl-1,3′-bi-1H-pyrazole-κ2N2,N2′)copper(II)

In the title complex, [CuCl2(C9H12N4)], the Cu-II atom exhibits a distorted square-planar coordination geometry involving two chloride ions and two N-atom donors from the bipyrazole ligand. The chelate ring including the Cu-II atom is essentially planar, with a maximum deviation of 0.0181 (17) angstrom for one of the coordinated N atoms. This plane forms a dihedral angle of 30.75 (6)degrees with the CuCl2 plane. In the crystal, each pair of adjacent molecules is linked into a centrosymmetric dimer by N-H center dot center dot center dot Cl hydrogen bonds. The crystal structure is stabilized by intermolecular C-H center dot center dot center dot N and C-H center dot center dot center dot Cl hydrogen bonds and weak slipped pi-pi stacking interactions between symmetry-related molecules, with an interplanar separation of 3.439 (19) angstrom and a centroid-centroid distance of 3.581 (19) angstrom.