title: 10-Benzoyl-phenanthrene-8,9-dicarboxylic anhydride.
abstract: The asymmetric unit of the title compound, C(23)H(12)O(4), contains two nearly parallel independent mol-ecules; the dihedral angles between the phenanthrene ring systems of the two mol-ecules and between the benzene rings of the two mol-ecules are 4.97 (9) and 8.1 (2)°, respectively. In each mol-ecule, the benzene ring is nearly perpendicular to the phenanthrene ring system, with dihedral angles of 86.42 (19) and 86.68 (18)°. π-π stacking exists between the phenanthrene ring systems of the two independent mol-ecules [centroid-centroid distance = 3.698 (2) Å]. Short intermolec-ular contacts [O⋯O = 2.86 (2) and C⋯O = 2.88 (2) Å] are also present in the crystal structure.
authors.affiliation: School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Hai-Tao
authors.initials: HT
authors.lastname: Yu
authors.forename: Yi
authors.initials: Y
authors.lastname: Wei
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang