Acta Cryst. (2004). E60, o2195-o2196 [ doi:10.1107/S1600536804027308 ]
Abstract: The crystal structure of the title salt adduct, C5H6NO+·NO3-·C5H5NO, has a C5H6NO+/C5HNO cation/molecule assembly (which lies on an inversion center) whose components are linked through their O atoms by a short hydrogen bond [2.446 (3) Å]. The cation is formally the 4-hydroxypyridinium cation and the neutral component the 4-pyridinone molecule, but the two could not be differentiated as they occupy equivalent positions, with the H atom disordered between them. The nitrogen-bound H atom interacts with the nitrate ion [2.840 (1) Å], which lies on another special position of site symmetry 2.
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