Bis(4-amino­pyridinium) sulfate monohydrate

The asymmetric unit of the title compound, 2C(5)H(7)N(2) (+)·SO(4) (2−)·H(2)O, 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.