4,6-Dinitro-pyrogallol

Abstract

In the title mol-ecule, C(6)H(4)N(2)O(7), the two nitro groups are tilted with respect to the aromatic ring by 11.2 (1) and 10.9 (1)°. All three hy-droxy groups are involved in the formation of bifurcated intra- and inter-molecular O-H⋯O hydrogen bonds. The crystal packing exhibits short O⋯O distances of 2.823 (2) Å between two O atoms of the nitro groups.

Fig. 1.

Molecular structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level.

Fig. 2.

Section of the hydrogen bonding network, showing bifurcated hydrogen bonds for all three hydroxy groups (displacement ellipsoids are drawn at the 50% probability level).