Complexes of nickel(II) with 5-methoxy-2-nitrosophenol (mono-oxime of 5-methoxy-ortho-benzoquinone)

Abstract

Abstract The complexes Ni(5-MeOqo)2, Ni(5-MeOqo)2·2py, Ni(5-MeOqo)2·PhNH2, K[Ni(5-MeOqo)3], Ni(4-Clqo)2· PhNH2 and K[Ni(4-Clqo)3]·(CH3)2CO, where 5-MeOqoH = 5-methoxy-2-nitrosophenoland4-ClqoH = 4-chloro-2-nitrosophenol, have been prepared. The magnetic susceptibilities, and electronic, i.r. and mass spectra of the complexes have been investigated. In the solid state the pyridine and aniline adducts and the complexes K[Ni(5-MeOqo)3] and K[Ni(4-Clqo)3]. (CH3)2CO contain six coordinate nickel. The complex Ni(5-MeOqo)2 is dimeric in chloroform, in the vapour and in the solid, and presumably contains five coordi- nate nickel. The pyridine adduct is monomeric in chloroform. The aniline adducts are monomeric at low concentration but Ni(4-Clqo)2·PhNH2 shows some degree of association at higher concentrations. Comparison of the i.r. spectra of the complexes with that of K[(4-Clqo)3Ni]·(CH3)2CO suggests that the NO of the ligand is probably bonded to the metal through the nitrogen atom.