(E)-6,8-Dichloro-3-{[(naphthalen-1-ylmethyl) iminiumyl]methyl}-2H-chromen-4-olate

In the title compound, C21H15Cl2NO2, the H atom of the -OH group is transferred to the N atom of the imine, forming a zwitterion. Thus, there is formation of a six-membered ring via an intramolecular O center dot center dot center dot H-N, rather than O-H center dot center dot center dot N, hydrogen bond in the molecule. The dihedral angle between the naphthalene ring system and the benzene ring of the 2H-chromen system is 87.41 (4)degrees. In the crystal, the molecules are packed through N-H center dot center dot center dot O, pi-pi [centroid-centroid distances = 3.744 (3) and 3.780 (3) angstrom], C-Cl center dot center dot center dot pi [Cl center dot center dot center dot centroid = 3.261 (3) angstrom], C-H center dot center dot center dot pi and C-H center dot center dot center dot O interactions.