Nickel(II) complexes of anti-2-furancarboxaldoxime

Five different complexes of nickel(II) withanti-2-furancarboxaldoxime (-FDH) have been prepared and characterized by elemental analysis, molecular weights, conductance studies, magnetic moments and infra-red spectral studies. These are Ni(FDH)₄Cl₂], Ni(FD)₂(FDH)], Ni(FD)₂(FDH)₂], Ni(FD)₂·en], and Ni(FD)₂]. All the complexes are neutral monomeric, paramagnetic (=3.3–3.7 B) and may be considered octahedral except the complex Ni(FD)₂], (=2.92 B) which is tetrahedral. In these complexes the ligand functions as a monodentate and/or bidentate, coordinating with furan oxygen and oxime oxygen in the latter case. The ligand has been shown to be present in the ionized, and/or unionized form in these complexes.