biostudies-literatureUnknown65(Pt 7)Fun HKIn the title compound, C(5)H(8)N(3) (+)·C(7)H(5)O(3) (-), the pyridine N atom is protonated. In the 4-hydroxy-benzoate anion, the carboxyl-ate group is twisted slightly out of the benzene ring plane by an angle of 3.77 (5)°. The protonated N atom and one of the two amino groups are hydrogen-bonded to the 4-hydroxy-benzoate anion through a pair of N-H⋯O hydrogen bonds, forming an R(2) (2)(8) ring motif. The crystal structure is further stabilized by O-H⋯O and C-H⋯O hydrogen bonds and π-π inter-actions involving the pyridinium rings [centroid-centroid distance of 3.6277 (5) Å], leading to the formation of a three-dimensional network.Acta crystallographica. Section E, Structure reports onlineo1496-7https://www.ebi.ac.uk/biostudies/studies/S-EPMC2969455biostudies-literature2,3-Diamino-pyridinium 4-hydroxy-benzoate.PMC2969455Fun HKBalasubramani Kfalse2,3-Diamino-pyridinium 4-hydroxy-benzoate.In the title compound, C(5)H(8)N(3) (+)·C(7)H(5)O(3) (-), the pyridine N atom is protonated. In the 4-hydroxy-benzoate anion, the carboxyl-ate group is twisted slightly out of the benzene ring plane by an angle of 3.77 (5)°. The protonated N atom and one of the two amino groups are hydrogen-bonded to the 4-hydroxy-benzoate anion through a pair of N-H⋯O hydrogen bonds, forming an R(2) (2)(8) ring motif. The crystal structure is further stabilized by O-H⋯O and C-H⋯O hydrogen bonds and π-π inter-actions involving the pyridinium rings [centroid-centroid distance of 3.6277 (5) Å], leading to the formation of a three-dimensional network.2009-01-01T00:00:00Z2009 Jun2025-04-05T15:54:08.289Z2019-03-27T00:00:10ZS-EPMC29694552158279610.1107/S1600536809020832