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Acta Cryst. (2013). E69, o536
[ doi:10.1107/S1600536813006594 ]

2-Hydroxy-7-nitrocyclohepta-2,4,6-trien-1-one

K. Lyczko and M. Lyczko

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-H...O hydrogen bonds. In addition, the crystal is stabilized by O...[pi] [3.4039 (14) Å] and O...O [3.073 (2) Å] interactions.


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