ROTATIONAL SPECTRA AND INTERNAL ROTATION OF 1,1,1,2,2-PENTAFLUOROPROPRANE AND 2,2,2- TRIFLUOROETHYLMETHYLETHER
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Date
2000
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Publisher
Ohio State University
Abstract
The rotational spectra of $CF_{3}CF_{2}CH_{3}$ and trans- and gauche-$CF_{3}CH_{2}OCH_{3}$, constitute alternative compounds to the CFCs, have been studied by microwave spectroscopy. The spectra were measured using Stark modulation and Fourier-transform microwave spectrometers at Shizuoka University. Both molecules exhibited the spectrum due to many excited states of the $CF_{3}$ torsion. Accurate rotational constants and quartic centrifugal distortion constants have been obtained for the ground and torsional excited slates up to $v=3$. The barrier heights to internal rotation of the $CF_{3}$ top have been determined for these molecules. Reasonable molecular structures have been derived from the observed rotational constants and were compared with those of ab initio calculations of GAUSSIAN $MP2/6-311G^{\ast \ast}$ level.
Description
Author Institution: Department of Chemistry, Faculty of Science, Shizuoka University