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4,5-DicarbÂoxyÂnaphthalene-1,8-dicarbÂoxyÂlic anhydride–1,10-phenanthroline (1/1)
In the crystal structure of the title 1:1 adduct, C12H8N2·C14H6O7, the carboxyl groups are involved in interÂmolecular O—H⋯O hydrogen bonds, which link the molÂecules into centrosymmetric dimers. These dimers are further linked by interÂmolecular O—H⋯N hydrogen bonds. C—H⋯O interÂactions also occur between the 1,10-phenanthroline (phen) and 4,5-dicarbÂoxyÂnaphthalene-1,8-dicarbÂoxyÂlic anhydride (H2NTC) molÂecules. In addition, the crystal structure exhibits π–π interÂactions 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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