Polymetallic Complexes, Part LXXIII: Complex of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Hg(II), Mn(II) and Fe(II) with NOON donor Bis-bidetate Chelating Azodye Ligands

Abstract

Sixteen dinuclear metal complexes of compositions [M₂L/L'
CI₂(H₂O)₆]  and  [M'₂L/L' CI₂(H₂O)₂] have been synthesised,
where LH₂ = 3,3' -di-(phenylazo)-di-β-naphthol, L'H₂ = 3,3'-di-(p-sulphonic
phenyl azo)-di-β-naphthol, M = Mn(II) Fe(II), Co(II),
Cu(II), Zn(II) and M' = Ni(II), Cd(II), Hg(II). The complexes of the
former category are either octahedral or distorted octahedral. The
Ni(II) complexes are square planar whereas Cd(II) and Hg(II) complexes
possess a tetrahedral  geometry around the metal ions. The
characterisation of ligands and the complexes is made basing upon
analytical, conductance, magnetic susceptibility, infrared, electronic
spectra apart from NMR, ESR and X-ray data. Both the azo dyes
behave as bis-bidentate ligands and coordinated to two metal ions
favouring the formation of dinuclear complexes.