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Acta Cryst. (2012). E68, o145  [ doi:10.1107/S1600536811053384 ]

5-Chloro-1H-indole-3-carboxylic acid

X.-L. Han and Y.-H. Luo

Abstract: In the title compound, C9H6ClNO2, the carboxyl group is twisted from the indole ring system by 9.00 (8)°. In the crystal, inversion dimers linked by pairs of O-H...O hydrogen bonds generate R22(8) loops and N-H...O hydrogen bonds link the dimers into (001) sheets. Aromatic [pi]-[pi] stacking interactions [centroid-centroid distance = 3.7185 (12) A °] are also observed.

Online 17 December 2011


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