Uronium 3-carboxy-4-hydroxybenzenesulfonate

Abstract

In the title compound, CH5N2O+· C7H5O6S-, the dihedral angle between the benzene ring and the mean plane of the uronium cation is 76.02(8)°. The carboxyl group in the anion is twisted by 1.47(9)° from the benzene ring. In the crystal, the cation is linked to the anion by weak O - H⋯O and N - H⋯O hydrogen bonds and π-π interactions [centroid-centroid distance = 3.8859(8)Å], forming a three-dimensional network.