2-[(E)-2-(4-Chlorophenyl)ethenyl]-1-methylpyridinium 4-bromobenzenesulfonate

In the title compound, C14H13ClN+·C6H4BrO3S−, the cation exists in an E configuration with respect to the ethenyl bond and is almost planar, the dihedral angle between the pyridinium and the benzene rings being 2.80 (7)°. The dihedral angles between the benzene ring of the anion and the pyridinium and benzene rings of the cation are 80.88 (7) and 79.05 (7)°, respectively. In the crystal, the cations are stacked into columns along the a axis as a result of π–π interactions between the pyridinium and chlorobenzene rings with a Cg...Cg distance of 3.6976 (8) Å. The anions are linked into chains along the a axis by weak C—H...O interactions. These anion chains are linked to adjacent cations by additional weak C—H...O and C—H...Br interactions, forming a two-dimensional network parallel to the ab plane. There are also short O...Br [3.2567 (11) Å] and C...O [2.9917 (18) Å] contacts. The crystal structure is further stabilized by C—H...π interactions involving the aromatic ring of the anion.

Abstract licence: CC BY

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