Acta Cryst. (2011). E67, o1509-o1510 [ doi:10.1107/S1600536811018848 ]
Abstract: The title compound, C7H6O5·H2O, is a new polymorph of the structures reported by Jiang et al. (2000) [Acta Cryst. C56, 594-595] and Okabe et al. (2001) [Acta Cryst. E57, o764-o766]. The gallic acid molecule is essentially planar (r.m.s. deviation = 0.550 Å). An intramolecular O-HO hydrogen bond occurs in the gallic acid molecule, which is linked to the water molecule by a further O-HO hydrogen bond. In the crystal, the components are linked by O-HO hydrogen bonds. The hydrogen-bonding pattern differs from those reported for the previous polymorphs.
Online 25 May 2011
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