1-Methyl-2-[(E)-2,4,5-trimeth­oxy­styr­yl]­pyridinium iodide

In the title compound, C(17)H(20)NO(3) (+)·I(−), the cation exists in the E configuration. The pyridinium and benzene rings are close to coplanar, with a dihedral angle of 7.43 (12)° between them. The three meth­oxy groups of 2,4,5-trimeth­oxy­phenyl are essentially coplanar with the benzene plane, with C—O—C—C torsion angles of 1.0 (3), −1.9 (3) and 3.6 (3)°. A weak intra­molecular C—H⋯O inter­action generates an S(6) ring motif. In the crystal, the cations are stacked in columns in an anti­parallel manner along the a axis through π–π inter­actions, with a centroid–centroid distance of 3.7714 (16) Å. The iodide anion is situated between the columns and linked to the cation by a weak C—H⋯I inter­action.