R factor = 0.052; wR factor = 0.116; data-to-parameter ratio = 12.3. In the title salt, C5H8N3 + C7H4NO4, the pyridine N atom of the 2,3-diaminopyridine molecule is protonated. The protonated N atom and one of the two 2-amino groups are hydrogen bonded to the 4-nitrobenzoate anion through a pair of N—H O hydrogen bonds, forming an R2 2 (8) ring motif. The carboxylate mean plane of the 4-nitrobenzoate anion is twisted by 3.77 (5) from the attached ring and the nitro group is similarly twisted by 2.28 (10). In the crystal, the molecules are linked by N—H O and C—H O interactions into sheets parallel to (100). Related literature For substituted pyridines, see: Pozharski et al. (1997)
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