Crystal structure of 1,1′-{(pentane-1,5-di­yl)bis[(aza­niumylyl­idene)methanylyl­idene]}bis(naphthalen-2-olate)

The whole mol­ecule of the title compound, C27H26N2O2, is generated by twofold rotational symmetry, with the central C atom of the pentyl chain located on the twofold rotation axis. The compound crystallizes as a bis-zwitterion, and there are two intra­molecular N—H⋯O hydrogen bonds generating S(6) ring motifs. In the crystal, mol­ecules are linked by pairs of C—H⋯O hydrogen bonds, forming ribbons propagating along [001], and enclosing R22(22) ring motifs.