Abstract
The i.r. spectra of tetrafluoro-1,3-dithietane as a vapour, in CCl 4 and CS 2 solutions, and as a crystalline solid at −180°C were recorded between 4000 and 200 cm −1. Far-i.r. spectra of the vapour and liquid were recorded between 400 and 40 cm −1. Raman spectra of the compound in the vapour phase, liquid state and as a crystalline solid at −180°C were obtained and polarization ratios calculated from the vapour and liquid state spectra. A force constant calculation was carried out in which the initial diagonal force constants were transferred from related molecules, leading to a reasonable set of fundamentals. An 11 parameter force field was derived, which gave good agreement with the assigned fundamentals and corresponded reasonably well with the amplitudes of vibration determined from an electron diffraction study. Four fundamentals were reassigned compared to an earlier investigation.
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