A critical review of the nucleosidic vibration modes appearing in the 800–500-cm−1 spectral region, based on new harmonic dynamics calculations
✍ Scribed by M. Ghomi; R. Letellier; E. Taillandier
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1988
- Tongue
- English
- Weight
- 622 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
On the basis of a harmonic dynamics calculation, it is shown that in the 800-500-cm-' spectral region of DNA vibrational spectra, the characteristic Raman peaks and ir bands do not arise from the same nucleosidic motions. The Raman spectra involve mainly the ring-breathing modes of nucleic bases while the ir spectra reveal essentially their out-of-plane vibrations. Moreover, the calculated results show the splitting of the guanine-and adenine-residue breathing modes upon their coupling with the sugar-pucker motions. This fact is in agreement with the poly[d(G-C)] and poly[d(A-T)] Raman spectra.