Dibenzo[b,g]indeno[1′,2′:3,4]fluoreno[1,2-d]oxonine-5,11,16,21-tetraone

Abstract

The asymmetric unit of the title compound, C34H16O5, contains two independent molecules (A and B) with similar conformations. The two benzene rings attached to the nine-membered ring are inclined to one another at 63.62 (14)° in molecule A and 68.23 (12)° in molecule B. One intramoleculer C—H...O hydrogen bond occurs in molecule A and two are observed in molecule B. In the crystal, molecules are linked by weak C—H...O hydrogen bonds, forming a three-dimensional network structure with R22(10) and R22(24) ring motifs. Aromatic π–π stacking interactions [centroid–centroid distances = 3.7572 (19), 3.6996 (19) and 3.7043 (19) Å] are also observed. The unit cell contains a pair of voids of 37 (2) Å3 about an inversion centre but the residual electron density (highest peak = 0.19 e Å−3 and deepest hole = −0.20 e Å−3) in the difference Fourier map suggests that no solvent molecule occupies this void.