Acta Cryst. (2011). E67, o435-o436  [ doi:10.1107/S1600536811001541 ]

4-Methoxyquinolinium-2-carboxylate dihydrate

M. Hemamalini and H.-K. Fun

Abstract: The title hydrated quinoline derivative, C₁₁H₉NO₃·2H₂O, crystallizes as a zwitterion in which the quinoline N atom is protonated. The quinoline ring is essentially planar, with a maximum deviation of 0.017 (2) Å. An intramolecular N-HO hydrogen bond between the protonated N atom and the O atom of the carboxylate group in the zwitterion forms an S(5) ring motif. In the crystal, the zwitterions are connected into inversion dimers via pairs of N-HO and C-HO hydrogen bonds with R₂²(4) and R¹₂(6) motifs. The water molecules are connected via O-HO hydrogen bonds, forming supramolecular chains along the c axis. Furthermore, the chains and the dimers are connected via O-HO hydrogen bonds, forming ladder-like supramolecular ribbons along the c axis.

Online 22 January 2011

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