The crystal structures of two novel polymorphs of bis(oxonium) ethane-1,2-disulfonate

• Main Authors: Jaroslaw Mazurek, Ana Fernandez-Casares
• Format: Article
• Language: English
• Published: International Union of Crystallography 2019-11-01
• Series: Acta Crystallographica Section E: Crystallographic Communications
• Subjects: crystal structure; polymorphism; oxonium cation; sulfonate anions
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S2056989019013367

Two novel crystal forms of bis(oxonium) ethane-1,2-disulfonate, 2H3O−·C2H4O6S22−, are reported. Polymorph II has monoclinic (P21/n) symmetry, while the symmetry of form III is triclinic (P\overline{1}). Both structures display extensive networks of O—H...O hydrogen bonds. While this network in Form II is similar to that observed for the previously reported Form I [Mootz & Wunderlich (1970). Acta Cryst. B26, 1820–1825; Sartori et al. (1994). Z. Naturforsch. 49, 1467–1472] and extends in all directions, in Form III it differs significantly, forming layers parallel to the ab plane. The sulfonate molecule in all three forms adopts a nearly identical geometry. The other observed differences between the forms, apart from the hydrogen-bonding network, are observed in the crystal density and packing index.