Acta Cryst. (2012). E68, o2155-o2156 [ doi:10.1107/S1600536812026402 ]
Abstract: The title compound, C17H20N2O3S, synthesised from sulfanilic acid and 4-diethylaminobenzaldehyde, crystallized out as a zwitterion with the central N atom protonated. The zwitterion exists in an E conformation with respect to the C=N double bond. The dihedral angle between the benzene rings is 37.57 (5)°. In the crystal, the zwitterions are linked into a tape along the a axis by N-HO hydrogen bonds. The crystal structure is further stabilized by weak C-HO interactions and - interactions with a centroid-centroid distance of 3.8541 (6) Å. An OO [2.8498 (11) Å] short contact is present.
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