Acta Crystallographica Section E

Structure Reports Online

Volume 68, Part 1 (January 2012)

organic compounds

Acta Cryst. (2012). E68, o196    [ doi:10.1107/S1600536811053578 ]

Acridin-10-ium 6-carb­oxy­pyridine-2-carboxyl­ate

K. Ha

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-H...O hydrogen bonds, forming chains along the b axis. The acridinium cations are linked to the anionic chains by strong N-H...O 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-H...O hydrogen bonds further stabilize the crystal structure.

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