organic compounds
(E)-1-Methyl-4-styrylpyridinium iodide monohydrate
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
In the title compound, C14H14N+·I−·H2O, the cation is essentially planar, with a dihedral angle of 2.55 (7)° between the pyridinium and phenyl rings, and exists in an E configuration with respect to the ethenyl bond. In the the cations are stacked in an antiparallel manner along the a axis. The cation is linked to the water molecule by a weak C—H⋯O interaction, and the water molecule is further linked to the I− ion by O—H⋯I hydrogen bonds. The is consolidated by these interactions and is further stabilized by a π–π interaction between the pyridinium and phenyl rings with a centroid–centroid distance of 3.6850 (8) Å.
Related literature
For bond-length data, see: Allen et al. (1987). For background to non-linear optical materials research, see: Chemla & Zyss (1987); Chia et al. (1995); Dittrich et al. (2003); Lin et al. (2002); Prasad & Williams (1991). For related structures, see: Chanawanno et al. (2008); Chantrapromma, Jindawong & Fun (2007); Chantrapromma, Jindawong, Fun & Patil (2007). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2005); cell 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).
Supporting information
https://doi.org/10.1107/S1600536809040446/is2467sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809040446/is2467Isup2.hkl
(E)-1-Methyl-4-styrylpyridinium iodide was prepared by mixing 1:1:1 molar ratio solutions of 1,4-dimethylpyridinium iodide (2 g, 8.5 mmol), benzaldehyde (0.86 ml, 8.5 mmol) and piperidine (0.84 ml, 8.5 mmol) in methanol (40 ml). The resulting solution was refluxed for 3 h under a nitrogen atmosphere. The yellow solid which formed was filtered and washed with diethylether. Yellow block-shaped single crystals of the title compound suitable for x-ray
were recrystallized from methanol by slow evaporation at room temperature over a few weeks (m.p. 489-490 K).Water H atoms were located in a difference map and refined isotropically. The remaining H atoms were positioned geometrically and allowed to ride on their parent atoms, with d(C—H) = 0.93 Å for aromatic and CH and 0.96 Å for CH3 atoms. The Uiso values were constrained to be 1.5Ueq of the
for methyl H atoms and 1.2Ueq for the remaining H atoms. A rotating group model was used for the methyl groups. The highest residual electron density peak is located at 0.70 Å from I1 and the deepest hole is located at 0.54 Å from I1.The design and synthesis of nonlinear optical (NLO) materials have been receiving much attention due to their numerous applications (Chemla & Zyss, 1987; Prasad & Williams, 1991). In the search for new organic NLO materials, aromatic compounds with extended π-conjugation system are extensively studied (Chia et al., 1995; Dittrich et al., 2003). Such materials require molecular hyperpolarizability and orientation in a noncentrosymmetric arrangement of the bulk material (Lin et al., 2002; Prasad & Williams, 1991). During the course of our systematic studies of organic NLO materials, we have previously synthesized and reported the crystal structures of pyridinium and quinolinium iodide (Chanawanno et al., 2008; Chantrapromma, Jindawong & Fun, 2007; Chantrapromma, Jindawong, Fun & Patil, 2007). Herein we report the of the title pyridinium derivative (I). However (I) crystallizes in centrosymmetric P21/c which precludes the second-order nonlinear optical properties.
The title compound consists of a C14H14N+ cation, an I- anion and one water molecule (Fig. 1). The cation exists in an E configuration with respect to the C6═C7 ethenyl bond [1.3429 (18) Å] with the torsion angle of C5–C6–C7–C8 = -179.95 (13)°. The cation is essentially planar with the dihedral angles between the pyridinium [C1–C5/N1] and benzene rings being 2.55 (7)°. The ethenyl unit is co-planar with the pyridinium and benzene rings as indicated by the torsion angles C1–C5–C6–C7 = -1.4 (2)° and C6–C7–C8–C9 = 1.6 (2)°. The rms deviation from the plane through the cation is 0.027 (15) Å. The bond distances in the cation have normal values (Allen et al., 1987) and comparable with the closely related compounds (Chanawanno et al., 2008; Chantrapromma, Jindawong & Fun, 2007; Chantrapromma, Jindawong, Fun & Patil, 2007).
In the crystal packing (Fig. 2), the cations are stacked in an antiparallel manner along the a axis. The cation is linked with the water molecule by a C—H···O weak interaction. The water molecule is further linked with the I- ion by O—H···I hydrogen bonds, forming a 3D network (Table 1). The crystal is consolidated by these interactions and further stabilized by π–π interactions with a distance of Cg1···Cg2iii = 3.6850 (8) Å [symmetry code: (iii) -x, 1-y, 2-z]; Cg1 and Cg2 are the centroids of the C1–C5/N1 and C8–C13 rings, respectively.
For bond-length data, see: Allen et al. (1987). For background to non-linerar optical materials research, see: Chemla & Zyss (1987); Chia et al. (1995); Dittrich et al. (2003); Lin et al. (2002); Prasad & Williams (1991). For related structures, see: Chanawanno et al. (2008); Chantrapromma, Jindawong & Fun (2007); Chantrapromma, Jindawong, Fun & Patil (2007). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986).
Data collection: APEX2 (Bruker, 2005); cell
SAINT (Bruker, 2005); data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).C14H14N+·I−·H2O | F(000) = 672 |
Mr = 341.18 | Dx = 1.660 Mg m−3 |
Monoclinic, P21/c | Melting point = 489–490 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 7.3636 (1) Å | Cell parameters from 6004 reflections |
b = 10.5929 (1) Å | θ = 2.3–35.0° |
c = 18.2807 (2) Å | µ = 2.33 mm−1 |
β = 106.770 (1)° | T = 100 K |
V = 1365.29 (3) Å3 | Block, yellow |
Z = 4 | 0.32 × 0.22 × 0.20 mm |
Bruker APEXII CCD area-detector diffractometer | 6004 independent reflections |
Radiation source: sealed tube | 5307 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.021 |
φ and ω scans | θmax = 35.0°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | h = −11→11 |
Tmin = 0.524, Tmax = 0.649 | k = −17→16 |
27548 measured reflections | l = −29→28 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.023 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.058 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0248P)2 + 0.8184P] where P = (Fo2 + 2Fc2)/3 |
6004 reflections | (Δ/σ)max = 0.004 |
163 parameters | Δρmax = 1.32 e Å−3 |
0 restraints | Δρmin = −0.56 e Å−3 |
C14H14N+·I−·H2O | V = 1365.29 (3) Å3 |
Mr = 341.18 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 7.3636 (1) Å | µ = 2.33 mm−1 |
b = 10.5929 (1) Å | T = 100 K |
c = 18.2807 (2) Å | 0.32 × 0.22 × 0.20 mm |
β = 106.770 (1)° |
Bruker APEXII CCD area-detector diffractometer | 6004 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 5307 reflections with I > 2σ(I) |
Tmin = 0.524, Tmax = 0.649 | Rint = 0.021 |
27548 measured reflections |
R[F2 > 2σ(F2)] = 0.023 | 0 restraints |
wR(F2) = 0.058 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | Δρmax = 1.32 e Å−3 |
6004 reflections | Δρmin = −0.56 e Å−3 |
163 parameters |
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K. |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2sigma(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
I1 | 0.742589 (15) | 0.831113 (9) | 0.885210 (5) | 0.02548 (3) | |
O1W | 0.20711 (19) | 0.98174 (12) | 0.94686 (7) | 0.0308 (2) | |
H1W1 | 0.086 (4) | 0.944 (3) | 0.9327 (16) | 0.060 (8)* | |
H2W1 | 0.210 (4) | 1.028 (2) | 0.9901 (15) | 0.048 (7)* | |
N1 | 0.53960 (16) | 0.74866 (11) | 1.12888 (6) | 0.01776 (19) | |
C1 | 0.3622 (2) | 0.68934 (13) | 1.00380 (8) | 0.0219 (2) | |
H1A | 0.3146 | 0.7096 | 0.9523 | 0.026* | |
C2 | 0.4699 (2) | 0.77624 (13) | 1.05393 (8) | 0.0218 (2) | |
H2A | 0.4948 | 0.8546 | 1.0360 | 0.026* | |
C3 | 0.5064 (2) | 0.63509 (12) | 1.15607 (7) | 0.0185 (2) | |
H3A | 0.5556 | 0.6174 | 1.2079 | 0.022* | |
C4 | 0.4006 (2) | 0.54563 (12) | 1.10806 (7) | 0.0187 (2) | |
H4A | 0.3796 | 0.4676 | 1.1275 | 0.022* | |
C5 | 0.32393 (19) | 0.57076 (12) | 1.02979 (7) | 0.0176 (2) | |
C6 | 0.2111 (2) | 0.47325 (12) | 0.98062 (7) | 0.0191 (2) | |
H6A | 0.1960 | 0.3967 | 1.0031 | 0.023* | |
C7 | 0.12773 (19) | 0.48617 (12) | 0.90531 (7) | 0.0188 (2) | |
H7A | 0.1434 | 0.5629 | 0.8832 | 0.023* | |
C8 | 0.01415 (19) | 0.38969 (12) | 0.85514 (7) | 0.0175 (2) | |
C9 | −0.0249 (2) | 0.27106 (12) | 0.88126 (8) | 0.0195 (2) | |
H9A | 0.0259 | 0.2496 | 0.9324 | 0.023* | |
C10 | −0.1394 (2) | 0.18542 (12) | 0.83081 (9) | 0.0214 (2) | |
H10A | −0.1634 | 0.1065 | 0.8482 | 0.026* | |
C11 | −0.2182 (2) | 0.21752 (13) | 0.75423 (8) | 0.0214 (2) | |
H11A | −0.2975 | 0.1609 | 0.7210 | 0.026* | |
C12 | −0.1783 (2) | 0.33396 (13) | 0.72750 (8) | 0.0226 (2) | |
H12A | −0.2297 | 0.3551 | 0.6763 | 0.027* | |
C13 | −0.0616 (2) | 0.41849 (13) | 0.77750 (8) | 0.0206 (2) | |
H13A | −0.0331 | 0.4956 | 0.7592 | 0.025* | |
C14 | 0.6473 (2) | 0.84639 (13) | 1.18135 (8) | 0.0234 (3) | |
H14A | 0.7349 | 0.8866 | 1.1588 | 0.035* | |
H14B | 0.7160 | 0.8079 | 1.2288 | 0.035* | |
H14C | 0.5611 | 0.9082 | 1.1906 | 0.035* |
U11 | U22 | U33 | U12 | U13 | U23 | |
I1 | 0.03493 (6) | 0.02076 (4) | 0.01682 (4) | −0.00883 (3) | 0.00120 (3) | 0.00305 (3) |
O1W | 0.0324 (6) | 0.0315 (6) | 0.0294 (5) | 0.0025 (5) | 0.0103 (5) | −0.0004 (4) |
N1 | 0.0178 (5) | 0.0184 (4) | 0.0172 (4) | −0.0012 (4) | 0.0054 (4) | −0.0003 (3) |
C1 | 0.0249 (7) | 0.0220 (6) | 0.0176 (5) | −0.0017 (5) | 0.0043 (5) | 0.0029 (4) |
C2 | 0.0247 (7) | 0.0209 (6) | 0.0199 (5) | −0.0022 (5) | 0.0065 (5) | 0.0038 (4) |
C3 | 0.0203 (6) | 0.0177 (5) | 0.0183 (5) | 0.0011 (4) | 0.0068 (4) | 0.0015 (4) |
C4 | 0.0207 (6) | 0.0174 (5) | 0.0191 (5) | 0.0005 (4) | 0.0074 (4) | 0.0018 (4) |
C5 | 0.0166 (5) | 0.0181 (5) | 0.0182 (5) | 0.0008 (4) | 0.0055 (4) | 0.0011 (4) |
C6 | 0.0202 (6) | 0.0177 (5) | 0.0194 (5) | 0.0002 (4) | 0.0060 (4) | 0.0017 (4) |
C7 | 0.0193 (6) | 0.0181 (5) | 0.0192 (5) | 0.0008 (4) | 0.0058 (4) | 0.0025 (4) |
C8 | 0.0159 (5) | 0.0178 (5) | 0.0188 (5) | 0.0006 (4) | 0.0051 (4) | 0.0005 (4) |
C9 | 0.0186 (6) | 0.0181 (5) | 0.0212 (5) | 0.0024 (4) | 0.0049 (4) | 0.0033 (4) |
C10 | 0.0207 (6) | 0.0158 (5) | 0.0281 (6) | 0.0012 (4) | 0.0077 (5) | 0.0023 (4) |
C11 | 0.0198 (6) | 0.0208 (6) | 0.0238 (6) | −0.0012 (5) | 0.0068 (5) | −0.0047 (4) |
C12 | 0.0243 (7) | 0.0251 (6) | 0.0178 (5) | −0.0005 (5) | 0.0054 (5) | 0.0005 (4) |
C13 | 0.0212 (6) | 0.0207 (5) | 0.0200 (5) | −0.0015 (5) | 0.0064 (5) | 0.0026 (4) |
C14 | 0.0248 (7) | 0.0228 (6) | 0.0224 (6) | −0.0050 (5) | 0.0065 (5) | −0.0044 (4) |
O1W—H1W1 | 0.94 (3) | C7—C8 | 1.4637 (18) |
O1W—H2W1 | 0.93 (3) | C7—H7A | 0.9300 |
N1—C2 | 1.3491 (17) | C8—C13 | 1.4005 (18) |
N1—C3 | 1.3507 (17) | C8—C9 | 1.4032 (19) |
N1—C14 | 1.4772 (18) | C9—C10 | 1.391 (2) |
C1—C2 | 1.377 (2) | C9—H9A | 0.9300 |
C1—C5 | 1.4003 (19) | C10—C11 | 1.394 (2) |
C1—H1A | 0.9300 | C10—H10A | 0.9300 |
C2—H2A | 0.9300 | C11—C12 | 1.389 (2) |
C3—C4 | 1.3711 (19) | C11—H11A | 0.9300 |
C3—H3A | 0.9300 | C12—C13 | 1.387 (2) |
C4—C5 | 1.4039 (18) | C12—H12A | 0.9300 |
C4—H4A | 0.9300 | C13—H13A | 0.9300 |
C5—C6 | 1.4608 (19) | C14—H14A | 0.9600 |
C6—C7 | 1.3429 (18) | C14—H14B | 0.9600 |
C6—H6A | 0.9300 | C14—H14C | 0.9600 |
H1W1—O1W—H2W1 | 104 (2) | C13—C8—C9 | 118.63 (12) |
C2—N1—C3 | 120.69 (12) | C13—C8—C7 | 118.12 (12) |
C2—N1—C14 | 118.90 (12) | C9—C8—C7 | 123.24 (11) |
C3—N1—C14 | 120.37 (11) | C10—C9—C8 | 120.19 (12) |
C2—C1—C5 | 120.49 (12) | C10—C9—H9A | 119.9 |
C2—C1—H1A | 119.8 | C8—C9—H9A | 119.9 |
C5—C1—H1A | 119.8 | C9—C10—C11 | 120.24 (12) |
N1—C2—C1 | 120.55 (12) | C9—C10—H10A | 119.9 |
N1—C2—H2A | 119.7 | C11—C10—H10A | 119.9 |
C1—C2—H2A | 119.7 | C12—C11—C10 | 120.06 (13) |
N1—C3—C4 | 120.65 (12) | C12—C11—H11A | 120.0 |
N1—C3—H3A | 119.7 | C10—C11—H11A | 120.0 |
C4—C3—H3A | 119.7 | C13—C12—C11 | 119.69 (13) |
C3—C4—C5 | 120.56 (12) | C13—C12—H12A | 120.2 |
C3—C4—H4A | 119.7 | C11—C12—H12A | 120.2 |
C5—C4—H4A | 119.7 | C12—C13—C8 | 121.14 (12) |
C1—C5—C4 | 117.05 (12) | C12—C13—H13A | 119.4 |
C1—C5—C6 | 124.05 (12) | C8—C13—H13A | 119.4 |
C4—C5—C6 | 118.90 (12) | N1—C14—H14A | 109.5 |
C7—C6—C5 | 124.71 (12) | N1—C14—H14B | 109.5 |
C7—C6—H6A | 117.6 | H14A—C14—H14B | 109.5 |
C5—C6—H6A | 117.6 | N1—C14—H14C | 109.5 |
C6—C7—C8 | 125.51 (12) | H14A—C14—H14C | 109.5 |
C6—C7—H7A | 117.2 | H14B—C14—H14C | 109.5 |
C8—C7—H7A | 117.2 | ||
C3—N1—C2—C1 | 0.5 (2) | C5—C6—C7—C8 | −179.95 (13) |
C14—N1—C2—C1 | −177.34 (14) | C6—C7—C8—C13 | −179.47 (14) |
C5—C1—C2—N1 | −0.2 (2) | C6—C7—C8—C9 | 1.6 (2) |
C2—N1—C3—C4 | −0.2 (2) | C13—C8—C9—C10 | −1.1 (2) |
C14—N1—C3—C4 | 177.64 (13) | C7—C8—C9—C10 | 177.78 (13) |
N1—C3—C4—C5 | −0.4 (2) | C8—C9—C10—C11 | −0.9 (2) |
C2—C1—C5—C4 | −0.3 (2) | C9—C10—C11—C12 | 1.8 (2) |
C2—C1—C5—C6 | 179.97 (14) | C10—C11—C12—C13 | −0.7 (2) |
C3—C4—C5—C1 | 0.7 (2) | C11—C12—C13—C8 | −1.3 (2) |
C3—C4—C5—C6 | −179.63 (13) | C9—C8—C13—C12 | 2.2 (2) |
C1—C5—C6—C7 | −1.4 (2) | C7—C8—C13—C12 | −176.72 (13) |
C4—C5—C6—C7 | 178.88 (14) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1W—H1W1···I1i | 0.94 (3) | 2.70 (3) | 3.6458 (14) | 177 (3) |
O1W—H2W1···I1ii | 0.93 (3) | 2.66 (2) | 3.5826 (12) | 174 (2) |
C14—H14A···O1Wii | 0.96 | 2.52 | 3.3775 (19) | 149 |
Symmetry codes: (i) x−1, y, z; (ii) −x+1, −y+2, −z+2. |
Experimental details
Crystal data | |
Chemical formula | C14H14N+·I−·H2O |
Mr | 341.18 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 7.3636 (1), 10.5929 (1), 18.2807 (2) |
β (°) | 106.770 (1) |
V (Å3) | 1365.29 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.33 |
Crystal size (mm) | 0.32 × 0.22 × 0.20 |
Data collection | |
Diffractometer | Bruker APEXII CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.524, 0.649 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 27548, 6004, 5307 |
Rint | 0.021 |
(sin θ/λ)max (Å−1) | 0.807 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.023, 0.058, 1.05 |
No. of reflections | 6004 |
No. of parameters | 163 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 1.32, −0.56 |
Computer programs: APEX2 (Bruker, 2005), SAINT (Bruker, 2005), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
O1W—H1W1···I1i | 0.94 (3) | 2.70 (3) | 3.6458 (14) | 177 (3) |
O1W—H2W1···I1ii | 0.93 (3) | 2.66 (2) | 3.5826 (12) | 174 (2) |
C14—H14A···O1Wii | 0.96 | 2.52 | 3.3775 (19) | 149 |
Symmetry codes: (i) x−1, y, z; (ii) −x+1, −y+2, −z+2. |
Acknowledgements
The authors thank the Malaysian Government and Universiti Sains Malaysia for the Research University Golden Goose grant No. 1001/PFIZIK/811012. KC thanks the Development and Promotion of Science and Technology Talents Project (DPST) for a study grant. The authors also thank the Prince of Songkla University for financial support.
References
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The design and synthesis of nonlinear optical (NLO) materials have been receiving much attention due to their numerous applications (Chemla & Zyss, 1987; Prasad & Williams, 1991). In the search for new organic NLO materials, aromatic compounds with extended π-conjugation system are extensively studied (Chia et al., 1995; Dittrich et al., 2003). Such materials require molecular hyperpolarizability and orientation in a noncentrosymmetric arrangement of the bulk material (Lin et al., 2002; Prasad & Williams, 1991). During the course of our systematic studies of organic NLO materials, we have previously synthesized and reported the crystal structures of pyridinium and quinolinium iodide (Chanawanno et al., 2008; Chantrapromma, Jindawong & Fun, 2007; Chantrapromma, Jindawong, Fun & Patil, 2007). Herein we report the crystal structure of the title pyridinium derivative (I). However (I) crystallizes in centrosymmetric P21/c space group which precludes the second-order nonlinear optical properties.
The title compound consists of a C14H14N+ cation, an I- anion and one water molecule (Fig. 1). The cation exists in an E configuration with respect to the C6═C7 ethenyl bond [1.3429 (18) Å] with the torsion angle of C5–C6–C7–C8 = -179.95 (13)°. The cation is essentially planar with the dihedral angles between the pyridinium [C1–C5/N1] and benzene rings being 2.55 (7)°. The ethenyl unit is co-planar with the pyridinium and benzene rings as indicated by the torsion angles C1–C5–C6–C7 = -1.4 (2)° and C6–C7–C8–C9 = 1.6 (2)°. The rms deviation from the plane through the cation is 0.027 (15) Å. The bond distances in the cation have normal values (Allen et al., 1987) and comparable with the closely related compounds (Chanawanno et al., 2008; Chantrapromma, Jindawong & Fun, 2007; Chantrapromma, Jindawong, Fun & Patil, 2007).
In the crystal packing (Fig. 2), the cations are stacked in an antiparallel manner along the a axis. The cation is linked with the water molecule by a C—H···O weak interaction. The water molecule is further linked with the I- ion by O—H···I hydrogen bonds, forming a 3D network (Table 1). The crystal is consolidated by these interactions and further stabilized by π–π interactions with a distance of Cg1···Cg2iii = 3.6850 (8) Å [symmetry code: (iii) -x, 1-y, 2-z]; Cg1 and Cg2 are the centroids of the C1–C5/N1 and C8–C13 rings, respectively.