Acta Cryst. (2004). E60, o2195-o2196  [ doi:10.1107/S1600536804027308 ]

Rerefinement of the co-crystal of 4-hydroxypyridine with 4-hydroxypyridinium nitrate

S. Gao, Z.-Z. Lu, L.-H. Huo, S. M. Zain and S. W. Ng

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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