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Vibrational Spectra and Structure of Small Ring Compounds: Vibrational Analysis of Gaseous and Polycrystalline Tetrafluoro-1,3-dithietane

Volume 27, Number 1 (Feb. 1973) Page 44-46

Harris, W.C.; Nuernberg, A.


The vibrational spectrum of tetrafluoro-1, 3-dithietane [Equation] has previously been investigated by Durig and Lord. Although emphasis in this earlier study was placed upon the nature of the potential function governing the out-of-plane ring mode, a vibrational assignment was also suggested. We have extended this study to include an analysis of the infrared and Raman spectra of polycrystalline tetrafluoro-1, 3-dithietane (TFDT) as well as the Raman spectrum of the gaseous sample (see Figs. 1 to 4). The utility of the low temperature Raman technique for the detection of weak transitions or for resolving complicated spectral patterns has recently been demonstrated by Levin and Harris. In addition, cryogenic studies have illustrated the possibility of assigning vibrations which are spectroscopically inactive for the isolated molecule. Durig et al., for instance, have observed the "infrared-inactive" methyl torsional fundamentals in several molecules by measuring the spectra at liquid nitrogen temperatures. In TFDT, therefore, it may be possible to specify the silent auCF2 twisting mode by suitable low temperature analysis.