| Summary: | The asymmetric unit of the title compound, C16H16N+·I−·H2O, contains two 1-methyl-4-{[(1E,3E)-4-phenylbuta-1,3-dienyl]}pyridinium cations, two iodide ions and two solvent water molecules. The cation is twisted slightly, the dihedral angle between the pyridinium and the phenyl rings being 10.68 (18)° in one molecule and 18.9 (3)° in the other. The two water molecules are disordered over three positions with site-occupancy ratio of 0.9/0.7/0.4. In the crystal packing, the cations are arranged into ribbons along the b axis with the iodide ions and water molecules located between adjacent cations. The cations are linked to the iodide ions and water molecules by weak C—H...I and C—H...O interactions, respectively. These interactions together with O—H...I hydrogen bonds link the molecules into a two-dimensional network parallel to the bc plane. π...π interactions with a centroid–centroid distance of 3.669 (2) Å are also observed.
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