C-Br...O supramolecular synthon: in situ cryocrystallography of low melting halogen-bonded complexes

In situ cryocrystallization of mixtures of 1,3-dibromotetrafluorobenzene and various oxygenated solvents afforded halogen bonded adducts. Single crystal X-ray analyses afforded structural information on the Br...O synthon and its role in driving the self-assembly process.