VIBRATIONAL SPECTRA OF TRANS-1.2-DIFLUOROETHYLENE OXIDE

$^{1}$ J. W. Agopovich, N. C. Craig, C. W. Gillies, and D. J. McGarvey, Paper FA7. 40th Symposium on Molecular Spectroscopy. Columbus. OH (1985).Author Institution: Department of Chemistry, Oberlin College; Department of Chemistry, Rennselaer Polytechnic InstituteInfrared and Raman spectra of trans-1,2-difluoroethylene oxide have yielded a complete assignment of the vibrational fundamentals of this molecule. The frequencies (in $cm^{-1}$) are: (a) 3086, 1480, 1271, 1162, 1057, 954, 511, 321: (b) 3068, 1320, 1135, 1099, 830, 578, 318. These new results for the 0-16 species have led to some adjustments in the previously reported assignments for the O-18 $species.^{1}$ Since the O-16/O-18 isotope shift in $n_{2}$ is only $3 cm^{-1}$, this mode must be largely CC (and CF) stretching Symmetric COC stretching is distributed between $n_{4}$. which shifts $16 cm^{-1}$, and $n_{6}$, which shifts $18 cm^{-1}$. Antisymmetric COC stretching must be largely confined to the surprisingly low frequency of $578 cm^{-1}$ for $n_{14}$, which shifts $20 cm^{-1}$. These results are a first good example of the effect of heavy atom substitution on the vibrations of a three- membered ring system