Acta Cryst. (2009). E65, o950-o951  [ doi:10.1107/S1600536809011386 ]

2-[(E)-2-(1H-Indol-3-yl)ethenyl]-1-methylpyridinium 4-bromobenzenesulfonate

S. Chantrapromma, T. Kobkeatthawin and H.-K. Fun

Abstract: In the title compound, C₁₆H₁₅N₂⁺·C₆H₄BrO₃S^-, the cation exists in the E configuration and is essentially planar with a dihedral angle of 3.10 (5)° between the pyridinium ring and the indole ring system. The -conjugated planes of the cation and the anion are inclined to each other at a dihedral angle of 64.32 (4)°. In the crystal structure, the cations are stacked in an antiparallel manner along the a axis. The anions are linked into a chain along the a axis. The cations and the anions are linked into a three-dimensional network by N-HO and weak C-HO hydrogen bonds. The crystal structure is further stabilized by C-H interactions. A - interaction between the five-membered heterocyclic ring of the indole system and the pyridinium ring is also observed with a centroid-centroid distance of 3.5855 (7) Å.

Online 2 April 2009

Copyright © International Union of Crystallography
IUCr Webmaster