A third monoclinic polymorph of 3,4,5-trihydroxybenzoic acid monohydrate
ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, vol.67, 2011 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 67
- Publication Date: 2011
- Doi Number: 10.1107/s1600536811018848
- Journal Name: ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Open Archive Collection: AVESIS Open Access Collection
- Ondokuz Mayıs University Affiliated: Yes
Abstract
The title compound, C7H6O5 center dot 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 A). An intramolecular O-H...O hydrogen bond occurs in the gallic acid molecule, which is linked to the water molecule by a further O-H...O hydrogen bond. In the crystal, the components are linked by O-H...O hydrogen bonds. The hydrogen-bonding pattern differs from those reported for the previous polymorphs.