Acta Cryst. (2012). E68, o196 [ doi:10.1107/S1600536811053578 ]
Abstract: The title compound, C13H10N+·C7H4NO4-, consists of a protonated acridinium cation and a 6-carboxypyridine-2-carboxylate monoanion. The carboxylate group of the anion appears to be delocalized on the basis of the nearly equivalent C-O bond lengths. In the crystal, the anions are connected by strong O-HO hydrogen bonds, forming chains along the b axis. The acridinium cations are linked to the anionic chains by strong N-HO hydrogen bonds between the carboxylate group of the anion and the N-H group of the cation. Along the b axis, successive chains stack in opposite directions. Weak intermolecular C-HO hydrogen bonds further stabilize the crystal structure.
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