Acta Cryst. (2010). E66, o651-o652  [ doi:10.1107/S1600536810006045 ]

1-Methyl-4-[(1E,3E)-4-phenylbuta-1,3-dienyl]pyridinium iodide monohydrate

H.-K. Fun, K. Chanawanno, C. Surasit and S. Chantrapromma

Abstract: 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-HI and C-HO interactions, respectively. These interactions together with O-HI hydrogen bonds link the molecules into a two-dimensional network parallel to the bc plane. interactions with a centroid-centroid distance of 3.669 (2) Å are also observed.

Online 20 February 2010

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