2-[(E)-2-(4-Chloro-phen-yl)ethen-yl]-1-methyl-pyridinium 4-methoxy-benzene-sulfonate.

In the asymmetric unit of the title salt, C(14)H(13)ClN(+)·C(7)H(7)O(4)S(-), there are two crystallographically independent mol-ecules for each component. Each cation adopts an E configuration with respect to the C=C bond and is slightly twisted; the dihedral angle between the pyridinium and benzene rings is 6.53 (7)° for one mol-ecule and 5.30 (7)° for the other. The meth-oxy groups in the anion mol-ecules are each twisted from the mean plane of benzene ring with torsion angles of 16.38 (19) and 4.32 (19)°. In the crystal structure, the cations are stacked in an anti-parallel manner along the a axis and the anions are linked together by C-H⋯O inter-actions into a layer parallel to (001). The anion layers are further linked to adjacent cations by C-H⋯O inter-actions. C-H⋯π inter-actions involving the benzene rings of both ions are also observed.