Acta Cryst. (2005). E61, o2419-o2421 [ doi:10.1107/S1600536805021021 ]
Abstract: The title compound, C6H11N3O22+·SO42-, crystallizes with two cations and two anions in the asymmetric unit. In both diprotonated histidinium cations, the C atom has a gauche-II conformation with respect to the amine N atom and it is in a trans position to the C atom. An extensive three-dimensional network of intermolecular N-HO and O-HO hydrogen bonds links the histidinium cations and sulfate anions, forming a crystal structure in which zigzag (Z1) head-to-tail sequences are observed for both the cations.
Online 6 July 2005
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