Received 24 May 2009
There are two independent molecules and one toluene solvent molecule in the asymmetric unit of the title compound, C25H12Br4·0.5C7H8. The dihedral angles between the fluorene ring systems are 85.30 (6) and 84.95 (6)° in the two molecules. The disortions in angles from the ideal sp3-hybridization geometry around the tetrahedral C atoms are due to the strain imposed by the central five-membered ring and steric effects.
For applications of spirobifluorene compounds, see: Hagen et al. (1997); Pudzich et al. (2006); Salbeck et al. (1997); Iour et al. (1990). For details of the synthesis, see: Marsitzky & Carter (2001).
Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH2831 ).
The authors thank Professors Bo Liu and Jianping Guo for supporting this work.
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