Tejender S. Thakur, M. Kirchner, D. Bläser
Jul 7, 2010
Citations
2
Influential Citations
89
Citations
Quality indicators
Journal
CrystEngComm
Abstract
The crystal structure of 1,2,3,5-tetrafluorobenzene, 1, has been determined and is compared with those of other polyfluoro-substituted benzenes. Compound 1 has a layered monoclinic structure in which the layers are held by bifurcated C–H⋯F–C interactions. Short F⋯F separations are also observed. The layers are stacked at van der Waals separation to give a 4 A packing. This structure is adopted instead of an alternative tetragonal structure adopted by fluorobenzene and a number of related compounds such as benzonitrile, pyridine N-oxide and alloxan. Compound 1 does not take the tetragonal structure mostly because this structure would demand the formation of a C–F⋯π interaction, which appears improbable for the molecule. The role of weak intermolecular interactions in the crystal packing of predominantly non-polar compounds is highlighted.