Acta Cryst. (2009). E65, o1496-o1497  [ doi:10.1107/S1600536809020832 ]

2,3-Diaminopyridinium 4-hydroxybenzoate

H.-K. Fun and K. Balasubramani

Abstract: In the title compound, C₅H₈N₃⁺·C₇H₅O₃^-, the pyridine N atom is protonated. In the 4-hydroxybenzoate anion, the carboxylate 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-hydroxybenzoate anion through a pair of N-HO hydrogen bonds, forming an R₂²(8) ring motif. The crystal structure is further stabilized by O-HO and C-HO hydrogen bonds and - interactions involving the pyridinium rings [centroid-centroid distance of 3.6277 (5) Å], leading to the formation of a three-dimensional network.

Online 6 June 2009

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