Abstract
Methyl torsions have long been of interest to chemists. They have been studied by a variety of techniques, including NMR, EPR, microwave and IR spectroscopy. Some of the interest in the torsional motion of a methyl group derives from its intrinsically different behavior from that of other normal modes of vibration. Unlike most skeletal vibrations, a methyl torsion typically has low frequency and large amplitude. These properties often are governed by an anharmonic potential function. Additionally, torsional motion always is accompanied by tunneling, a property that cannot be treated using rigid molecular point groups. Finally, the motion of a methyl group often is hindered by a small torsional barrier. In that event, there can be strong coupling between its internal rotation and the overall rotation of the molecule. Detailed studies of this coupling can provide valuable insights into intramolecular dynamics.
Keywords
- Barrier Height
- Internal Rotation
- Fluorescence Excitation Spectrum
- Conformational Preference
- Torsional Motion
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Spangler, L.H., Pratt, D.W. (1995). Internal rotation dynamics from electronic spectroscopy in supersonic jets and beams. In: Hollas, J.M., Phillips, D. (eds) Jet Spectroscopy and Molecular Dynamics. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1314-4_9
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DOI: https://doi.org/10.1007/978-94-011-1314-4_9
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