title: 6-[(4-Hy-droxy-phen-yl)diazenyl]-1,10-phenanthrolin-1-ium chloride monohydrate.
abstract: In the cation of the title mol-ecular salt, C(18)H(13)N(4)O(+)·Cl(-)·H(2)O, the dihedral angle between the mean planes of the 1,10-phenanthroline system and the phenol ring is 14.40 (19)°. The crystal packing is stabilized by O-H⋯O hydrogen bonds, weak N-H⋯Cl and O-H⋯Cl inter-molecular inter-actions and π-π stacking inter-actions [centroid-centroid distance = 3.6944 (13) and 3.9702 (12) Å].
authors.affiliation: Department of Chemistry, 600 Lincoln Ave., Charleston, IL 61920,  USA.
authors.forename: Akram
authors.initials: A
authors.lastname: Hazeen
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Minchong
authors.initials: M
authors.lastname: Mao
authors.forename: Kraig A
authors.initials: KA
authors.lastname: Wheeler
authors.forename: Mark E
authors.initials: ME
authors.lastname: McGuire