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Acta Cryst. (2012). E68, o3363-o3364
[ doi:10.1107/S1600536812046363 ]

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

S. K. Mohamed, M. Akkurt, M. N. Tahir, A. A. Abdelhamid and A. A. Marzouk

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 [pi]-[pi] 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.


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