An electron diffraction study of the molecular structure of BIS(trifluoromethyl) monoselenide

The molecular structure of (F₃C)₂Se has been determined in the vapour phase by the sector microphotometer method of electron diffraction. Two structures, differing essentially in the angles of rotation of the CF₃- groups about the C-Se bonds, are in good agreement with the data. The mean C-Se and C-F bond lengths are 1.978 and 1.333 Å, respectively.