(E)-4-[2-(4-Ethoxyphenyl)ethenyl]-1-methylpyridinium 4-bromobenzenesulfonate methanol hemisolvate

Abstract

In the title compound, C16H18NO+·C6H4BrO3S−·0.5CH3OH, the cation exists in the E configuration and the whole mol­ecule of the cation, except for the O atom of the eth­oxy group, is disordered with a site-occupancy ratio of 0.695 (5):0.305 (5). The cation is disordered in such a way that the ethenyl units of the major and minor components are related by 180° around the long mol­ecular axis. In the major component, the cation is almost planar, the dihedral angle between the pyridinium and benzene rings being 0.8 (3)°, whereas in the minor component, the dihedral angle between the two aromatic rings is 4.2 (6)°. In the crystal, the cations are stacked in an anti­parallel manner along the a axis, while the anions and methanol mol­ecules are linked through O—H⋯O hydrogen bonds and Br⋯O short contacts [3.0248 (13) Å] into a tape along the same direction. The three components are further linked by weak C—H⋯O, C—H⋯Br and C—H⋯π inter­actions.