Abstract
The infrared and Raman spectra of gaseous 7-oxabicyclo(4.1.0)hept-3-ene and 7-oxabicyclo(4.1.0)hept-2-ene have been recorded between 50 and 3300 cm−1. The low frequency ring puckering mode of these molecules has been treated as the ring inversion of a pseudo-four-membered ring and the one dimensional potential function describing this motion is found to have considerable asymmetry due to the presence of the epoxide ring. A series of Q branches beginning at 122 cm−1 in the 7-oxabicyclo(4.1.0)hept-3-ene spectra has been fit to a potential function of the form V (x) =3.238×104x4−0.710×104x2+0.958×104x3. A series of Q branches beginning at 187 cm−1 in the 7-oxabicyclo(4.1.0)hept-2-ene spectra has been fitted to a potential function of the form V (x) =3.948×105x4−0.391×105x2+0.172×105x3.
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