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High resolution Raman spectroscopy of gases with laser sources. IX. The rotational spectra of cycloheptane and cyclooctane
Author(s) -
Kainnady Jacob V.,
Weber Alfons
Publication year - 1976
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250040309
Subject(s) - cyclooctane , cycloheptane , chemistry , raman spectroscopy , conformational isomerism , spectral line , molecule , crystallography , ring (chemistry) , physics , optics , organic chemistry , astronomy , catalysis
The pure rotational Raman spectra of cycloheptane (C 7 H 14 ) and cyclooctane (C 8 H 16 ) vapor were photographed using a high resolution plane grating spectrograph. Both spectra resemble those of symmetric top rotors. The spectrum of cycloheptane has well developed R‐ and S‐branches while for cyclooctane the R‐branch lines are only just observable. The molecular constants obtained for these two molecules are for cycloheptane: B =0.099 3801±0.000 0047 cm −1 and D J =(4.08± ±0.17) × 10 −8 cm −1 while for cyclooctane: B 0.073 221±0.000 039 cm −1 and D J =(0.784±0.039) × 10 −8 cm −1 where the quoted errors are one standard deviation. Since both molecules exist at room temperature in several conformations these constants are average values over the various conformers.