Non Deprotonated Metal Complexes of the Bis-amide Tetradentate Ligand N,N′ -(Dipicolyl) -1,8-naphthylenediamine

Abstract
Complexes of the general formula M(LH2)Cl2 · 2 H2O, where LH2 = N,N′-(dipicolyl)-1,8-naphthylenediamine and M = Mn, Ni and Cu, have been prepared. None of the metal ions used promote amide deprotonation on coordination: LH2 acts as a tetradentate ligand. Distorted octahedral stereochemistries for the complexes in the solid state have been proposed utilising microanalyses, magnetic susceptibilities, molar conductance measurements and IR and visible spectral data. The Ni(II) complex exhibits evidence of a polymeric structure.

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