title: 2-[(Pyridin-2-yl)amino]-pyridinium 2,4,6-tri-nitro-phenolate.
abstract: In the cation of the title salt, C10H10N3 (+)·C6H2N3O7 (-), the pyridine and pyridinium rings are linked by an intra-molecular N-H⋯N hydrogen bond and are approximately coplanar, with a dihedral angle between their planes of 4.24 (6)°. In the crystal, the cations and anions are linked through N-H⋯O hydrogen bonds, forming supra-molecular chains propagating along the c-axis direction. π-π stacking is observed between neighbouring chains, the centroid-centroid distances being 3.7638 (11) (between pyridinium rings) and 3.5331 (11) Å (between benzene rings).
authors.affiliation: Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska 64/13, 01601 Kyiv, Ukraine.
authors.forename: Kateryna A
authors.initials: KA
authors.lastname: Ohui
authors.affiliation: Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska 64/13, 01601 Kyiv, Ukraine.
authors.forename: Irina A
authors.initials: IA
authors.lastname: Golenya
authors.affiliation: Department of Chemistry, Saint Petersburg State University, Universitetsky Pr. 26, 198504 Stary Petergof, Russian Federation.
authors.forename: Nadezhda A
authors.initials: NA
authors.lastname: Bokach