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The asymmetric unit of the title compound, 2C5H7N2+·SO42−·H2O, contains two 4-aminopyridinium cations (A and B), a sulfate dianion and a water molecule. One of the 4-aminopyridinium cations (B) is disordered over two orientations with refined site occupancies of 0.568 (4) and 0.432 (4). The non-H atoms of the 4-aminopyridinium cations are essentially coplanar, with a maximum deviation of 0.055 (1) Å (in cation A), 0.022 (3) Å (for the major component in cation B) and 0.009 (3) Å (for the minor component in cation B). In the crystal, the sulfate O atoms link the 4-aminopyridinium cations and water molecules into a three-dimensional network via intermolecular O—H...O, N—H...O and C—H...O hydrogen bonds. The crystal structure is further consolidated by N—H...O(water) and C—H...O(water) hydrogen bonds.