Buy article online - an online subscription or single-article purchase is required to access this article.
organic compounds
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.