2,2′-[(4,6-Dinitro-1,3-phenylene)dioxy]diacetic acid hemihydrate

Abstract

The skeletons of both independent molecules of the carboxylic acid hemihydrate, C10H8N2O10·0.5H2O, are approximately planar [maximum deviations 0.642 (3) and 0.468 (1) Å]. The deviations arise from the twisting of the nitro groups with respect to the aromatic rings [dihedral angles = 3.24 (2) and 27.01 (1), and 7.87 (1) and 16.37 (2)° in the two molecules]. The crystal structure features intermolecular O—H...O hydrogen bonds, which the link the dicarboxylic acid and water molecules into a supramolecular layer network.