| Summary: | In the crystal structure of the title 1:1 adduct, C12H8N2·C14H6O7, the carboxyl groups are involved in intermolecular O—H...O hydrogen bonds, which link the molecules into centrosymmetric dimers. These dimers are further linked by intermolecular O—H...N hydrogen bonds. C—H...O interactions also occur between the 1,10-phenanthroline (phen) and 4,5-dicarboxynaphthalene-1,8-dicarboxylic anhydride (H2NTC) molecules. In addition, the crystal structure exhibits π–π interactions of the phen...phen and H2NTC...H2NTC types with centroid–centroid distances of 3.579 (3) and 3.774 (3) Å, respectively.
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