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In the title compound, 2C5H7N2+·C7H4O6S2−, the ions are linked by six N—H⋯O hydrogen bonds into layers parallel to the (100) plane. The adjacent layers are cross-linked into a double layer by C—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The asymmetric unit of the title structure, C3H5N2+·C7H5O6S−, consists of an imidazolium cation and a sulfosalicylate anion connected via an N—H...O hydrogen bond. In the crystal structure, intermolecular hydrogen bonds and π–π stacking interactions [with centroid–centroid distances of 3.655 (2)–4.075 (2) Å] link the molecules into a three-dimensional framework. [ABSTRACT FROM AUTHOR]

The anion of the title compound, 2C6H13N4+·C6Cl2O42−·4H2O, is centrosymmetric. The crystal structure is stabilized by a network of intermolecular hydrogen bonds. The solvent water molecules are disordered, each with approximate 2:1 occupancy of two positions. [ABSTRACT FROM AUTHOR]