Rotational spectrum of the tetrafluoromethane-ethylene oxide

none4siThe rotational spectrum of one conformer of the CF4–ethylene oxide complex has been measured by using a pulsed jet Fourier-transform microwave spectrometer. The observed conformer is stabilized by a CF3⋯O halogen bond, with a distance rC⋯O of ∼3.341 Å. No experimental evidence of the internal rotation of CF4 with respect to ethylene oxide has been observed, but it is expected to be almost free (V3 ∼ 14 cm−1 from ab initio calculations).mixedGou, Qian; Feng, Gang; Evangelisti, Luca; Caminati, WaltherGou, Qian; Feng, Gang; Evangelisti, Luca; Caminati, Walthe