Synthesis, crystal structures and properties of two copper (II) complexes with pyridazine derivative ligand

Two new complexes, [Cu(L)(2)(CH3OH)] center dot (ClO4)(2) (1) and [Cu(L)(2)(H2O)] center dot (NO3)(2) (2), have been synthesized and their crystal structures have been determined by X-ray analysis, where L = 3-(3,5-bimethylpyrazole-yl)-6-chloro-pyridazine]. The complex 1 crystallizes in the monoclinic, space group C2/c, and the coordination configuration of copper (II) is better described as trigonal pyramidal geometry with four N atoms from L and one O-methanol(center dot) The coordination configuration of 2 is quite similar to that of 1 except O-water instead of O-methanol(center dot) The intermolecular hydrogen bonds link the repeat units and extend the molecules to multinuclear structures in both compounds. The spectral properties of the title compounds have been studied and discussed. Furthermore, the antibacterial activities of the title compounds have been detected, the results indicate that the ligands and two copper(II) complexes exhibit certain fungicidal activities again several bacteria.