Hindered Rotation in Halogenated Ethanes

Abstract

If it is assumed on the basis of available evidence that the ``staggered'' form of the molecule is more stable than the ``eclipsed'' one, then the eight haloethanes investigated by means of the Raman effect show the following number of forms: CCl₃CF₃ and CCl₃CHFCl one form (13 and 18 lines); CF₂ClCF₂Cl, CF₂BrCF₂Br, CF₂ClCF₂H and CF₂ClCFCl₂ two forms (23, 22, 21 and 24 lines) and CF₂ClCHFCl and CF₂BrCFClBr three forms (29 and 28 lines). These forms are considered to be distinct rotational isomers.