Vibrational Spectrum of Hexafluoro-2-Butyne

Abstract

Infrared and Raman spectra have been obtained for hexafluoro-2-butyne, including qualitative depolarizations and gaseous state frequencies for the stronger Raman lines. The data provide good evidence that D3d selection rules are followed. From this it appears that there must be hindered rotation between the CF3 groups, with the ``staggered'' configuration being stable. An assignment of fundamental frequencies has been made for this model. The origin of the potential barrier is not known. (See note added in proof at end of paper.)