Zwitterionic 1-{(1)-[(4-hy-droxy-phen-yl)iminio]meth-yl}naphthalen-2-olate: crystal structure and Hirshfeld surface analysis.

The title zwitterion, CHNO (systematic name: 1-{(1)-[(4-hy-droxy-phen-yl)iminium-yl]meth-yl}naphthalen-2-olate), features an intra-molecular charge-assisted N-H⋯O hydrogen bond. A twist in the mol-ecule is evident around the N-C(hy-droxy-benzene) bond [C-N-C-C torsion angle = 39.42 (8)°] and is reflected in the dihedral angle of 39.

Crystal structure of (E)-N-[(2-meth-oxy-naphthalen-1-yl)methyl-idene]-3-nitro-aniline.

In the title compound, C18H14N2O3, the dihedral angle between the naphthalene ring system and the benzene ring is 59.99 (13)°. A short intra-molecular C-H⋯N contact closes an S(6) ring.