Acta Crystallographica Section E
Volume 63, Issue 11, pages o4276–o4277, November 2007
How to Cite
Smith, G., Wermuth, U. D. and White, J. M. (2007), 2,3-Dimethoxy-10-oxostrychnidinium 2-carboxy-4,5-dichlorobenzoate. Acta Crystallographica E, 63: o4276–o4277. doi: 10.1107/S1600536807047952
The structure of the title compound, C23H27N2O4+·C8H3Cl2O4−, a 1:1 proton-transfer compound of brucine with 4,5-dichlorophthalic acid, has been determined at 130 K. The brucinium cations and the hydrogen phthalate anions associate through single N—H...Ocarboxylate hydrogen bonds [2.639 (3) Å], giving dimers which are extended via weak head-to-tail C—H...Omethoxy associations into chains forming down the 21 screw axis of the unit cell. The carboxyl proton of the anion gives a short intramolecular O—H...Ocarboxylate hydrogen bond [2.441 (3) Å].