Acta Cryst. (2013). E69, o536 [ doi:10.1107/S1600536813006594 ]
Abstract: The title compound, also known as 7-nitrotropolone, C7H5NO4, exists in the crystalline state as the 2-hydroxy-7-nitrocyclohepta-2,4,6-trien-1-one tautomer and not as 2-hydroxy-3-nitrocyclohepta-2,4,6-trien-1-one. The dihedral angle between the ring and the nitro group is 70.3 (2)°. In the crystal, neighbouring molecules are linked into dimers by a pair of O-HO hydrogen bonds. In addition, the crystal is stabilized by O [3.4039 (14) Å] and OO [3.073 (2) Å] interactions.
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