Abstract
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 sp 3-hybridization geometry around the tetrahedral C atoms are due to the strain imposed by the central five-membered ring and steric effects.
Highlights
There are two independent molecules and one toluene solvent molecule in the asymmetric unit of the title compound, C25H12Br4Á0.5C7H8
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
Summary
Key indicators: single-crystal X-ray study; T = 293 K; mean (C–C) = 0.007 A; R factor = 0.043; wR factor = 0.091; data-to-parameter ratio = 14.7. There are two independent molecules and one toluene solvent molecule in the asymmetric unit of the title compound, C25H12Br4Á0.5C7H8. 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. Related literature 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)
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