Acta Cryst. (2009). E65, o258-o259  [ doi:10.1107/S1600536809000026 ]

Bis{4-[(E)-2-(1H-indol-3-yl)ethenyl]-1-methylpyridinium} 4-fluorobenzenesulfonate nitrate 0.25-hydrate

S. Chantrapromma and H.-K. Fun

Abstract: In the title compound, 2C₁₆H₁₅N₂⁺·C₆H₄FO₃S^-·NO₃^-·0.25H₂O, the two cations are nearly planar, with dihedral angles of 1.34 (14) and 4.6 (2)°, respectively, between the pyridinium and indole rings. The cations each adopt E configurations with respect to the C=C bonds and are inclined to each other with a dihedral angle of 77.66 (5)°. The ethenyl group of one cation is disordered over two sites with occupancies of 0.685 (12) and 0.315 (12), and the sulfonate group of the 4-fluorobenzenesulfonate anion is also disordered with occupancies of 0.535 (10) and 0.465 (10) for the two sets of O atoms. The anion is also inclined to the two cations, with dihedral angles between the mean planes of the benzene ring and the -conjugated systems of the cations of 24.72 (11) and 79.83 (11)°. In the crystal structure, the cations are stacked in an antiparallel fashion into columns approximately along the a axis and are further linked through the anions into a three-dimensional network via N-HO and C-HO interactions. The water molecule forms O-HO hydrogen bonds to the nitrate anion and C-H interactions are also observed.

Online 8 January 2009

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