“…The isolated CH stretching frequencies have been obtained by McKean [13].The overtones of the CH stretching vibrations have been measured up to v = 7 by Baylor and Weitz [14] and a good agreement was found with the corresponding isolated CH stretching frequencies. Finally, Durig et al [15] have measured the far infrared spectrum in the gas phase and have been able to assign the methyl torsional fundamental as well as two hot bands.…”
“…The isolated CH stretching frequencies have been obtained by McKean [13].The overtones of the CH stretching vibrations have been measured up to v = 7 by Baylor and Weitz [14] and a good agreement was found with the corresponding isolated CH stretching frequencies. Finally, Durig et al [15] have measured the far infrared spectrum in the gas phase and have been able to assign the methyl torsional fundamental as well as two hot bands.…”
“…A gas phase spectrum of propene was obtained to determine the relative intensity changes upon formation of the monolayer, and there are assignments in the literature that give qualitative descriptions of the relative intensities of the modes in the liquid (e.g., very strong, strong, medium weak) . The assignments given in Table are made for a molecule with C s point group symmetry, which allows identification of the modes as either in-plane (A‘) or out-of-plane (A‘ ‘). − The in-plane modes for all four propenes are marked with dashed lines in Figures −4, while the out-of-plane modes are marked with solid lines. 1 FT-IRAS of gas phase propene at 300 K (top) and a propene monolayer adsorbed on the Cu(111) surface at 100 K (bottom). Vibrational assignments are given in Table .…”
Fourier transform infrared reflection absorption spectra (FT-IRAS)
have been obtained for adsorbed monolayers
of propene and a set of fluorinated propenes
(CFH2CHCH2,
CF3CHCH2, and
CF3CFCF2) on the Cu(111) surface. These species interact weakly with the copper
surface. The FT-IRAS spectra indicate that the
molecules lie flat with the plane of the molecule defined by the
CCC atoms essentially parallel to the
surface regardless of the degree of fluorination. Quantitative
analysis of the orientation of hexafluoropropene
determines the tilt of the molecular plane with respect to the surface
to be 11°. The results for propene
indicate a molecular tilt of 20°. Where the ν(CC) mode
can be identified in the spectra of the adsorbed
molecules, there is no perturbation of its frequency, which indicates
that there is little backdonation between
the metal and the π* orbital of the propene.
“…The energy order of these stretching vibrations is CH op < CH ip < CH o < CH c < CH t , according to several literature reports [30][31][32][33][34]. Fang et al [33] explain that CH op shows lower frequency than CH ip because it is affected by a nonbonded anisotropic interaction with the p electrons of the C5 5C double bond.…”
Section: Propenementioning
confidence: 99%
“…In general, a mixture of Lorentzian (90%) and Gaussian (10%) functions was used in the process. The number of bands present in each spectral region was obtained from the literature [30]. A summary of gas phase and liquid Kr solution frequencies and bandwidths (Dv 1/2 ) is presented in Table 3.…”
Section: Propenementioning
confidence: 99%
“…Gas [30,33] Gas-solution Frequency (cm À1 ) Dv 1/2 (cm À1 ) Frequency (cm À1 ) Dv 1/2 (cm À1 ) Dv (cm À1 )…”
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