title: 3-{(E)-[(4-Formyl-phen-yl)iminium-yl]meth-yl}naphthalen-2-olate.
abstract: The title Schiff base compound, C(18)H(13)NO(2), is a zwitterion, with the naphthol hy-droxy group deprotonated and the imine N atom protonated. It adopts an E configuration about the central C=N double bond. The dihedral angle between the naphthyl ring system and the benzene ring is 1.73 (11)°. An intra-molecular N-H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, adjacent mol-ecules are connected by inter-molecular C-H⋯O hydrogen bonds, forming a supra-molecular ribbon along the b axis.
authors.forename: Abeer Mohamed
authors.initials: AM
authors.lastname: Farag
authors.forename: Siang Guan
authors.initials: SG
authors.lastname: Teoh
authors.forename: Hasnah
authors.initials: H
authors.lastname: Osman
authors.forename: Madhukar
authors.initials: M
authors.lastname: Hemamalini
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun