In the crystal structure of the title compound, C14H10F2O, the dihedral angles between the benzene rings in the two crystallographically independent molecules are 46.9 (2) and 47.6 (2)°. The molecules are linked into dimers by C—H⋯F interactions and these dimers are further stacked into columns along the b axis by π–π interactions between the benzene rings [centroid–centroid distance = 3.8221 Å; the dihedral angle between the planes of these rings is 4.87 (2)°]. In addition, C—F⋯π interactions also contribute to the crystal packing (C⋯centroid distance = 3.5919 Å).
The title compound, C14H6O7·C10H8N2, has been hydrothermally synthesized. Structural ananlysis indicates that the crystals are produced by cocrystallization of naphthalene-1,4,5,8-tetracarboxylic acid 1,8-anhydride and 4,4′-bipyridine (bpy) molecules. The crystal packing is stabilized by intermolecular O—H⋯N and C—H⋯O hydrogen bonds and π–π stacking interactions [centroid–centroid distances = 3.5846 (9) Å].
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