Bis(2-amino-5-bromopyridinium) fumarate dihydrate

• Main Authors: Ching Kheng Quah, Madhukar Hemamalini, Hoong-Kun Fun
• Format: Article
• Language: English
• Published: International Union of Crystallography 2010-09-01
• Series: Acta Crystallographica Section E
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S1600536810030989

In the title compound, 2C5H6BrN2+·C4H2O42−·2H2O, the complete fumarate dianion is generated by crystallographic inversion symmetry. The cation is approximately planar, with a maximum deviation of 0.036 (1) Å. In the anion, the carboxylate group is twisted slightly away from the attached plane; the dihedral angle between carboxylate and (E)-but-2-ene planes is 6.11 (14)°. In the crystal, the carboxylate O atoms form bifurcated (N—H...O and C—H...O) and N—H...O hydrogen bonds with the cations. The crystal packing is stabilized by R22(8) ring motifs which are generated by pairs of N—H...O hydrogen bonds. The crystal structure is further consolidated by water molecules via O(water)—H...O and N—H...O(water) hydrogen bonds. The components are linked by these interactions into three-dimensional network.