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Two novel crystal forms of bis-(oxonium) ethane-1,2-di-sulfonate, 2H 3 O - ·C 2 H 4 O 6 S 2  2- , are reported. Polymorph II has monoclinic ( P 2 1 / n ) symmetry, while the symmetry of form III is triclinic ( P ). 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 &amp; Wunderlich (1970 ▸). Acta Cryst. B 26 , 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 mol-ecule 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.

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