2,7-Dibromo-10′H-spiro[fluorene-9,9′-phenanthren]-10′-one

Abstract

The title racemic spiro compound, C26H14Br2O, crystallizes with two independent molecules (AandB) in the asymmetric unit. The mean plane of the phenanthrene unit is twisted with respect to the mean plane of the fluorene unit by 82.38 (15) and 80.25 (5)° in moleculesAandB, respectively. In the crystal, theAandBmolecules are linked by a pair of C—H...O hydrogen bonds and a pair of short Br...O contacts [2.935 (2) Å], forming a centrosymmetric four-molecule unit. These units are linked by C—H...π interactions, forming ribbons propagating along theb-axis direction. The ribbons are linked by C—Br...π interactions, forming layers parallel to theabplane.