Far-infrared spectrum and barriers to internal rotation of propanal

Gamil A. Guirgis; W. E. Brewer; Jian Liu; Stephen Bell; James R. Durig

doi:10.1117/12.56378

1 March 1992 Far-infrared spectrum and barriers to internal rotation of propanal

Gamil A. Guirgis, W. E. Brewer, Jian Liu, Stephen Bell, James R. Durig

Proceedings Volume 1575, 8th Intl Conf on Fourier Transform Spectroscopy; (1992) https://doi.org/10.1117/12.56378
Event: Eighth International Conference on Fourier Transform Spectroscopy, 1991, Lubeck-Travemunde, Germany

Abstract

The far-infrared spectrum has been recorded from 50 to 360 cm-1 at a resolution of 0.10 cm-1 for propanol, CH3CH2CHO, as well as for three additional isotopic species, CH3CH2CDO, CH3CD2CHO, and CD3CD2CHO. The fundamental methyl torsional transitions have been observed for both the s-cis and gauche conformers for all four isotopic species from which the threefold barriers to internal rotation have been calculated. For the gauche conformer V3 equals 1040 +/- 50 cm-1 and V6 equals 23 +/- 11 cm-1, and for the s-cis conformer V3 equals 850 +/- 50 cm-1. The asymmetric torsional transitions for each isotopic species have also been assigned, and the potential function governing the internal rotation of the CHO rotor has been determined. The data include significant coupling between the symmetric and asymmetric rotors.

Citation Download Citation

Gamil A. Guirgis, W. E. Brewer, Jian Liu, Stephen Bell, and James R. Durig "Far-infrared spectrum and barriers to internal rotation of propanal", Proc. SPIE 1575, 8th Intl Conf on Fourier Transform Spectroscopy, (1 March 1992); https://doi.org/10.1117/12.56378

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