Volume 66 Received 14 February 2010 | |||||||||||
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aX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, and bCrystal Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand
Correspondence e-mail: hkfun@usm.my
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. ![[pi]](/logos/entities/pi_rmgif.gif)

interactions with a centroid-centroid distance of 3.669 (2) Å are also observed.
For bond-length data, see: Allen et al. (1987
). For background to non-linear optical materials research, see: Raimundo et al. (2002
). For related structures, see: Chantrapromma et al. (2009a
,b
), Fun et al. (2009
). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer, (1986
).
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Data collection: APEX2 (Bruker, 2005
); cell refinement: SAINT (Bruker, 2005
); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008
); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009
).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SJ2731 ).
KC thanks the Development and Promotion of Science and Technology Talents Project (DPST) for a study grant. The authors thank Prince of Songkla University for financial support and Universiti Sains Malaysia for the Research University Golden Goose grant No. 1001/PFIZIK/811012.
Allen, F. H., Kennard, O., Watson, D. G., Brammer, L., Orpen, A. G. & Taylor, R. (1987). J. Chem. Soc. Perkin Trans. 2, pp. S1-19.
Bruker (2005). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Chantrapromma, S., Chanawanno, K. & Fun, H.-K. (2009a). Acta Cryst. E65, o1144-o1145.
![[details]](../../../../../../e/graphics/details.gif)
Chantrapromma, S., Chanawanno, K. & Fun, H.-K. (2009b). Acta Cryst. E65, o3115-o3116.
![[details]](../../../../../../e/graphics/details.gif)
Cosier, J. & Glazer, A. M. (1986). J. Appl. Cryst. 19, 105-107.
![[details]](../../../../../../j/graphics/details.gif)
Fun, H.-K., Surasit, C., Chanawanno, K. & Chantrapromma, S. (2009). Acta Cryst. E65, o2633-o2634.
![[details]](../../../../../../e/graphics/details.gif)
Raimundo, J.-M., Blanchard, P., Planas, N. G., Mercier, N., Rak, I. L., Hierle, R. & Roncali, J. (2002). J. Org. Chem. 67, 205-218.
![[ChemPort]](../../../../../../logos/chemportborder.gif)
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
![[details]](../../../../../../a/graphics/details.gif)
Spek, A. L. (2009). Acta Cryst. D65, 148-155.
![[details]](../../../../../../d/graphics/details.gif)