In the cation of the title molecular salt, C18H13N4O+_Cl__H2O, 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 intermolecular interactions and _—_ stacking interactions [centroid–centroid distance = 3.6944 (13) and 3.9702 (12) [A °]
Hazeen, Akram; Zhang, Yan; Mao, Minchong; Wheeler, Kraig A.; and McGuire, Mark E., "6-[(4-Hydroxyphenyl)diazenyl]- 1,10-phenanthrolin-1-ium chloride monohydrate" (2011). Faculty Research and Creative Activity. Paper 1.