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Acta Cryst. (2007). E63, o2784 [ doi:10.1107/S1600536807020958 ]
Abstract: The title compound, C6H5NO3, commonly known as 6-hydroxynicotinic acid, is found to be a tautomer of it. Four molecules, all adopting a planar conformation, are found in the asymmetric unit. The compound forms hydrogen-bonded sheets parallel to the [001] direction via intermolecular N-H
O and O-HO hydrogen bonds. Each sheet consists of interconnected dimers created by R22(8) N-HO hydrogen-bonded motifs and infinite chains formed by C(7) hydrogen-bonded motifs. Alternatively, these sheets can be viewed as infinitely fused 32-membered hydrogen-bonded rings.
Online 3 May 2007
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