Synthesis and Characterization of New Trinuclear vic‐Dioxime Complexes with Ni(II) and Cu(II) Ions

Abstract A new vic‐dioxime ligand, [5,6;11,12‐di(cyclohexyl)2,3‐bis(hydroxyimino)‐8,9‐diimino‐1,4‐diazacyclododecanenickel(II)]chloride, [NiDHDD]Cl2 (2), has been synthesized by the template condensation reaction of [N,N′‐bis‐(2‐aminocyclohexyl)‐ethanedialdiminenickel(II)]chloride, [NiBAED]Cl2 (1) with anti‐dichloroglyoxime in methanol solution at −10 °C. A homotrinuclear complex of [NiDHDD]Cl2 (2), is formed with Ni(II) chloride and a heterotrinuclear complex of this ligand with Cu(II) chloride has been synthesized. The complexes [M(NiDHDD)2]Cl4 have been characterized on the basis of elemental analyses, magnetic susceptibility measurements, conductivity measurements, IR and electronic spectral studies. The trinuclear Ni(II) and Cu(II) complexes of the vic‐dioxime ligand [NiDHDD]Cl2 (2), have a M:ligand ratio of 1:2 and the ligand coordinates only through the N,N atoms, as do most vicinal dioximes. The molar conductivities in DMF solution indicate the electrolytic nature for the complexes.