title: 1,1'-{(Hexane-1,6-di-yl)bis-[(aza-niumylyl-idene)methanylyl-idene]}bis-(naphthalen-2-olate).
abstract: The whole molecule of the title Schiff base compound, C28H28N2O2, is generated by inversion symmetry. It is formed from two units of ortho-hy-droxy-naphthaldehyde bridged with 1,6-di-amino-hexane. The N atoms are protonated and, thus, the structure is a bis-zwitterionic compound in the solid state. The zwitterion shows strong intra-molecular N-H⋯O hydrogen bonds between the iminium N and the naphthaleno-late O atoms.
authors.affiliation: Laboratoire d'Electrochimie, d'Ingénierie Moléculaire et de Catalyse Redox, Faculty of Technology, University of Sétif-1, 19000 Sétif, Algeria.
authors.forename: Kamel
authors.initials: K
authors.lastname: Ouari
authors.affiliation: Laboratoire d'Electrochimie, d'Ingénierie Moléculaire et de Catalyse Redox, Faculty of Technology, University of Sétif-1, 19000 Sétif, Algeria.
authors.forename: Sabrina
authors.initials: S
authors.lastname: Bendia
authors.affiliation: Laboratoire d'Electrochimie, d'Ingénierie Moléculaire et de Catalyse Redox, Faculty of Technology, University of Sétif-1, 19000 Sétif, Algeria.
authors.forename: Moufida
authors.initials: M
authors.lastname: Merzougui
authors.affiliation: Service de Radiocristallographie, Institut de Chimie de Strasbourg, UMR 7177, CNRS-Unistra, 1 rue Blaise Pascal, Strasbourg 67008, France.
authors.forename: Corinne
authors.initials: C
authors.lastname: Bailly
keywords: 1,6-di­amino­hexa­ne; 2-hy­droxy-1-naphthaldehyde; crystal structure; elemental analysis.; hydrogen bonding