ISSN:
0377-0486
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The pure rotational Raman spectra of 1,3,5-trifluorobenzene and hexafluorobenzene have been photographed under high resolution using a single mode argon laser as the exciting source. The observed spectra consist of sharp, highly symmetric lines which form well developed R- and S-branches. The analysis of the spectra was performed on the basis of the theory of the non-rigid, symmetric top rotor. The following ground state constants were determined. For 1,3,5-trifluorobenzene, Bo = 0.0586517 ± (5 × 10-7) cm-1 and Dj = (1.89 ± 0.04) × 10-9 cm-1; for hexafluorobenzene, Bo = 0.0343165 ± 9 × 10-7 cm-1 and Dj = (0.70 ± 0.04) × 10-9 cm-1. The C—F bond lengths for these molecules were determined by assuming the values of the carbon ring parameters of benzene. The C—F bond lengths (r0-values) of 1,3,5-trifluorobenzene and hexafluorobenzene are then, respectively, 1.304 Å and 1.321 Å. These values are in good agreement with the C—F bond lengths determined by means of the electron diffraction technique.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jrs.1250010102
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