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In the title compound, C14H12N2O6, the dihedral angle between the benzene and pyridine rings is 65.90 (7)°. The nitro group is disordered and tilted with respect to the mean plane of the pyridine ring by 21.5 (4) and 22.8 (5)°, for the major and minor components, respectively. In the crystal, molecules are linked by O—H...N hydrogen bonds, forming chains propagating along [10-1]. The chains are linked by C—H...O hydrogen bonds, forming a three-dimensional framework. The crystal packing is further stabilized by offset π–π stacking interactions [intercentroid distance = 3.6291 (9) Å]