Acta Cryst. (2010). E66, o580-o581 [ doi:10.1107/S1600536810004526 ]
Abstract: The title Schiff base compound, C13H11NO5S·3H2O, formed from sulfanilic acid and 2,4-dihydroxybenzaldehyde, crystallized out as a zwitterion with the N atom protonated. The asymmetric unit consists of one 4-[(2,4-dihydroxybenzylidene)ammonio]benzenesulfonate and three water molecules. The zwitterion exists in an E configuration with respect to the central C=N double bond. The two benzene rings of the molecule are oriented at a dihedral angle of 27.33 (8)°. An intramolecular N-HO hydrogen bond stabilizes the molecular structure. In the crystal, the zwitterions are linked into chains along [101] by intermolecular O-HO and N-HO hydrogen bonds. The three water molecules link these chains into a three-dimensional framework by additional intermolecular O-HO hydrogen bonds. A interaction [3.5485 (9) Å] further stabilizes the crystal structure.
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