Structural implications of the microwave spectrum of hexafluoropropene

摘要

Analysis of the microwave spectrum of hexafluoropropene, C3F6, has yielded rotational constants for the ground vibrational state of 2557.88, 1255.033, and 987.082 MHz. Assignments have also been made on the first four excited states of the CF3torsional mode and on the first excited state of another lowhyphen;lying skeletal mode. A rough estimate of 350 cmminus;1has been obtained for the barrier to internal rotation of the CF3group. The groundhyphen;state moments of inertia are consistent with the expected geometry of the molecule, in which all atoms are coplanar except for two equivalent F atoms in the CF3group.