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

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: LH2acts as a tetradentate ligand.