title: 1-(3-Acetyl-phen-yl)-2-(2-oxidonaph-thalen-1-yl)diazen-1-ium.
abstract: The title compound, C18H14N2O2, crystallized with two independent zwitterion mol-ecules (A and B) in the asymmetric unit. They are both close to planar, the dihedral angle between the benzene ring and naphthalene ring system being 4.30 (9)° in A and 4.69 (9)° in B. Each mol-ecule has an E conformation with respect to the azo double bond. In each of the independent mol-ecules, an intra-molecular N-H⋯O hydrogen bond forms an S(6) ring motif. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds, forming -A-A-A- and -B-B-B- chains parallel to one another and propagating along the a-axis direction. There are also π-π inter-actions between adjacent mol-ecules involving benzene and naphthalene rings [centroid-centroid distance of 3.626 (3) Å for adjacent A mol-ecules and 3.652 (3) Å for adjacent B mol-ecules].
authors.affiliation: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale (CHEMS), Département de Chimie, Université Mentouri de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Hassiba
authors.initials: H
authors.lastname: Bougueria
authors.forename: Ali
authors.initials: A
authors.lastname: Benosmane
authors.forename: Mohamed Amine
authors.initials: MA
authors.lastname: Benaouida
authors.forename: Abd El Kader
authors.initials: Ael K
authors.lastname: Bouchoul
authors.forename: Salah Eddine
authors.initials: SE
authors.lastname: Bouaoud
references.citation: J Org Chem. 2004 Apr 16;69(8):2902-5
references.pmid: 15074952
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Acta Crystallogr D Biol Crystallogr. 2009 Feb;65(Pt 2):148-55
references.pmid: 19171970