Synthesis and spectroscopic studies on (4,5-dimethyl-3-pyrazolyl) aldazine nickel(II) complexes

Summary (4,5-Dimethyl-3-pyrazolyl)aldazine, L, reacts with nickel(II) salts to form 11 and 12 complexes. The 11 binuclear systems involve two ligands bridging two nickels, in which L behaves as a tetradentate ligand, and the nickel(II) complexes have pseudo-octahedral stereo-chemistry. Some of the 11 and 12 complexes contain coordinated H₂O and bridging OH. Structures of these complexes are proposed on the basis of elemental analyses, conductivity, spectral data (u.v.-vis. and i.r.) and magnetic susceptibilities.