1-{[4-(4-{[(2-Oxidonaphthalen-1-yl)methyl­idene]aza­nium­yl}phen­oxy)phen­yl]iminiumylmeth­yl}naphthalen-2-olate

The title Schiff base compound, C₃₄H₂₄N₂O₃, was prepared by a condensation reaction of bifunctional aromatic diamine (4,4′-diamino­diphenyl ether) with hy­droxy­naphtaldehyde. The asymmetric unit contains two independent mol­ecules with similar conformations. The compound contains a central oxygen bridge and two functionalized [(E)-(phenyl­iminio)meth­yl]naphthalen-2-olate units. The dihedral angles between the benzene rings linking to the central O atom are 74.64 (19) and 69.85 (18)° in the two independent mol­ecules. Intra­molecular O—H...O hydrogen bonding occurs between the protonated imino N atoms and deprotonated hy­droxy O atoms in both mol­ecules. In the crystal, weak C—H...O hydrogen bonds are observed.