title: 4,4'-(o-Phenyl-enedioxy-dimethyl-ene)dipyridinium dinitrate.
abstract: The cation of the salt, C(18)H(18)N(2)O(2) (2+)·2NO(3) (-), lies about a twofold rotation axis. The pyridinium ring is almost coplanar with the phenyl-ene ring [dihedral angle between rings = 5.69 (9)°]. The crystal structure shows π-π stacking inter-actions [centroid-centroid distance = 3.70 (1) Å] between the pyridinium rings and the phenyl-ene rings, generating a linear chain structure. The cation also forms two N-H⋯O hydrogen bonds to two nitrate groups.
authors.forename: Ping
authors.initials: P
authors.lastname: Zou
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhang
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Jun
authors.initials: J
authors.lastname: Qiao
authors.forename: Jin-Sheng
authors.initials: JS
authors.lastname: Gao