Zi-Liang Wang

Benzimidazolium 2-carb­oxy-4-hydroxy­benzene­sulfonate trihydrate

The ions and water molecules of the title compound, C7H7N2+·C7H5O6S−·3H2O, are organized into an infinite two-dimensional network via N—H⋯O and O—H⋯O hydrogen bonds parallel to the (100) plane.

Bis(benzimidazolium) naphthalene-1,5-disulfonate trihydrate

The title compound, 2C7H7N2 +·C10H6O6S2 2−·3H2O, consists of two crystallographically independent benzimidazolium cations, two independent naphthalene-1,5-disulfonate dianions (both generated by inversion) and three water molecules. These components construct an infinite three-dimensional framework in the crystal structure via O—H⋯O and N—H⋯O hydrogen bonds.

Bis(ethylammonium) (–)-(2S,3S)-tartrate monohydrate

# 2006 International Union of Crystallography All rights reserved The asymmetric unit of the title salt, 2C2H8N + C4H4O6 H2O, contains two ethylammonium cations, one (2S,3S)-( )tartrate anion and one water molecule, which are linked by intermolecular N—H O and O—H O hydrogen bonds, leading to an infinite three-dimensional framework. An intramolecular hydrogen bond influences the structure of the (2S,3S)-( )-tartrate anion.