4-Phenyl­pyridinium hydrogensquarate

The 4-phenyl­pyridinium cation of the title compound, C11H10N+·C4HO4−, exhibits an interplanar angle of 28.6 (1)° and interacts with a neighbouring hydrogensquarate anion through a single N—H⋯O hydrogen bond [N⋯O = 2.697 (2) A]. Individual anions are linked into centrosymmetric dimers by strong O—H⋯O hydrogen bonds [H⋯O = 1.52 A and O⋯O = 2.493 (2) A]. Alternating layers of 4-phenyl­pyridinium cations and hydrogensquarate anions are stacked along the [001] axis.