C-H···F-C hydrogen bonding in 1,2,3,5-tetrafluorobenzene and other fluoroaromatic compounds and the crystal structure of alloxan revisited

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 Å 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···∏ interaction, which appears improbable for the molecule. The role of weak intermolecular interactions in the crystal packing of predominantly non-polar compounds is highlighted.