2-[(E)-4-(Diethyl­amino)­styr­yl]-1-methyl­pyridinium iodide

In the title compound, C(18)H(23)N(2) (+)·I(−), the cation exists in the E configuration with respect to the ethenyl C=C bond. The pyridinium and benzene rings are nearly coplanar, making a dihedral angle of 4.63 (7)°. The two ethyl groups of the diethyl­amino substituent point in opposite directions with respect to the benzene plane. In the crystal, the cation and the iodide anion are linked by a weak C—H⋯I inter­action. The cations are stacked in an anti-parallel manner along the a axis by a π–π inter­action with a centroid–centroid distance of 3.5262 (9) Å. The crystal structure is further stabilized by C—H⋯π inter­actions.