8-Hydroxyquinoline-O-sulfuric Acid and its Monohydrate

8-Hydroxyquinoline-O-sulfuric acid exists as a zwitterion in both its anhydrous, C₉H₇NO₄S, and monohydrated, C₉H₇NO₄S.H₂O, forms. In each case, one of the terminal O atoms of the sulfate group is trans to the C8 atom. The structures are stabilized by intermolecular hydrogen bonds.

-1