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Acta Cryst. (2003). E59, o1766-o1767 [ doi:10.1107/S1600536803022670 ]
Abstract: The crystal structure of indole-3-carboxylic acid, C9H7NO2, shows the presence of centrosymmetric hydrogen-bonded cyclic carboxylic acid dimers [O
O = 2.649 (2) Å]. These dimers are linked into a sheet structure through peripheral intermolecular hydrogen bonds between the carboxylic acid groups and the hetero-amine group of the n-glide-related indole ring [ON = 3.013 (2) Å].
Online 23 October 2003
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