Acta Cryst. (2013). E69, o1543-o1544 [ doi:10.1107/S1600536813024975 ]
Abstract: The asymmetric unit of the title salt, C8H10N5+·C7H7O3S-, consists of two amino[(1H-benzimidazol-2-yl)amino]methaniminium cations and two 4-methylbenzenesulfonate anions. The cations are each stabilized by intramolecular N-HN hydrogen bonds between the free amino groups and the imine N atoms of the benzimidazole units, forming S(6) ring motifs. In the crystal, cations and anions are linked by N-HO and C-HO hydrogen bonds, forming a three-dimensional supramolecular framework. Two strong - stacking interactions [centroid-centroid distances = 3.4112 (14) and 3.4104 (14) Å] also occur between the centroids of the imidazole rings of like cations.
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