4,5-Dihydroxy-1-nitroanthracene-9,10-dione

In the search for new tautomeric systems among anthraquinone derivatives, we carried out an X-ray structural study of the title compound, 4,5-dihydroxy-1-nitro-9,10-anthraquinone, C₁₄H₇NO₆. The asymmetric unit contains two symmetry independent molecules. Both anthraquinone tricyclic units (ATU) adopt a nearly planar conformation. The influence of the nitro group does not cause any fundamental changes in the distribution of the bond lengths in the intramolecular system of hydrogen bonds.

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