Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 10 (October 2013)

organic compounds

Acta Cryst. (2013). E69, o1543-o1544    [ doi:10.1107/S1600536813024975 ]

Amino­[(1H-benzimidazol-2-yl)amino]­methaniminium 4-methyl­benzene­sulfonate

S. K. Mohamed, M. Akkurt, M. A. A. Elremaily, A. M. Ali and M. R. Albayati

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-H...N 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-H...O and C-H...O hydrogen bonds, forming a three-dimensional supra­molecular framework. Two strong [pi]-[pi] 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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