4,5-Dicarb­oxy­naphthalene-1,8-dicarb­oxy­lic anhydride–1,10-phenanthroline (1/1)

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