Table 2. Angular Geometries, Intermolecular I···Y Distances (r0, Å), and Intermolecular Stretching Force Constants (kσ, N m–1) As Derived Experimentally from Rotational Spectroscopy in the Gas Phase for a Series of Halogen-Bonded Complexes with ClI and CF3–I.

Cs at equilibrium, C2v in the zero-point state.
These molecules possess low barriers to internal rotation/other motion. The point group of highest symmetry achieved during the motion is given.