ジメチルケトン,メチルエチルケトン,ジエチルケトン,ジメチルアミンおよびジエチルアミンのRaman,IRならびにNMR

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タイトル別名
  • ジメチルケトン メチルエチルケトン ジエチルケトン ジメチルアミン オヨビ ジ
  • The Raman, IR and NMR of Dimethyl, Methylethyl, and Diethyl Ketone and Dimethyl, and Diethyl Amine

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The authors obtain the Raman, IR and NMR spectra of CH3-CO-CH3, CH3-CO- -C2H5, C2H5-CO-C2H5, CH3-NH-CH3 and C2H5-NH-C2H5. The spectra have been analysed on the basis of a bent structure, but the present observations show that the obtained spectra can be explained on the basis of a non-rigid linear structure, in which CH2 group rotates freely with respect to the three hydrogen atoms of CH3 group. Because the observations are in good agreement with theoretical expectations for a nonrigid D3d model for R-CO-R and R-NH-R (R=CH3, C2H5) and for a non-rigid C3v model for CH3-CO-C2H5. A non-rigid structure is strongly supported by the NMR spectra. It seems to the authors sufficient evidence to justify a non-rigid linear model for C2H5-COC2H5 and CH3-CO-C2H5 that the both spectra are too simple to be explained on the basis of a bent model and that the coincidence between Raman and infrared frequencies which is the one of spectral features of C3v symmetry for CH3-CO-C2H5 occurs and the lack of coincidence between Raman and infrared frequencies which is the drastic one of spectral features of D3d symmetry with a symmetry center for C2H5-CO-C2H5 and C2H5-NH-C2H5 except in the frequencies due to CH2 group occurs.

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