Abstract

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 <i>et al.,</i> 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 a_uCF₂ twisting mode by suitable low temperature analysis.

Raman Spectrum of 1,3-Butadiene in the Gaseous and Liquid States*

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Vibrational Spectra and Calculated Thermodynamic Properties of 1,1,1,2-Tetrachloroethane and Pentachloroethane*

J. Rud Nielsen, C. Y. Liang, and Lester W. Daasch
J. Opt. Soc. Am. 43(11) 1071-1078 (1953)

Raman Spectra of Cis- and Trans-2-Butene in the Gaseous and Liquid States*

Charles M. Richards and J. Rud Nielsen
J. Opt. Soc. Am. 40(7) 442-445 (1950)

Lattice vibrations of CdCl₂, CdBr₂, MnCl₂, and CoCl₂: infrared and Raman spectra*

D. J. Lockwood
J. Opt. Soc. Am. 63(3) 374-382 (1973)

Infrared–infrared double-resonance spectra of CH₃OD

J. C. Petersen and G. Duxbury
J. Opt. Soc. Am. B 7(10) 1997-2001 (1990)