8-Hydroxy-7-nitroquinoline-5-sulfonic Acid Monohydrate

The title compound, C₉H₆N₂O₆S.H₂O, is zwitterionic (i.e. 8-hydroxy-7-nitroquinolinium-5-sulfonate monohydrate) with a deprotonated sulfonic group and a protonated quinoline N atom which interacts with the hydroxy O atom. The H atom of the hydroxy group is distal to the N atom and is involved in an interaction with an O atom of the nitro group, which is oriented at 32.2 (1)° with respect to the quinoline ring system.

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