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Acta Cryst. (2012). E68, o706 [ doi:10.1107/S1600536812005351 ]
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3-ioda-3,5-dioxatricyclo[5.3.1.04,11]undeca-1(11),7,9-triene-9-carboxylic acidAbstract: In the title compound, C9HI3O6·2H2O, the molecule is located on a twofold axis that gives rise to disorder of the carboxyl group. This disorder is correlated with the disorder of one of the H atoms of the water molecule. The carboxyl group is twisted relative to the attached benzene ring by 75.1 (4)°. The intramolecular I
O distance is 2.112 (6) Å. Molecules are linked via O-HO hydrogen bonding, C-IO halogen bonding, with IO distances in the range 3.156 (5)-3.274 (6) Å, and dipolar C=OC=O interactions between the carboxyl and carboxylate groups, with an OC distance of 2.944 (10) Å.
Online 17 February 2012
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