## Breathing V i b r a t i o n of Poly-1-alanine a-Helix I n a previous paper' the normal frequencies and modes were calculated for the poly-1,-alanine a-helix, arid the far-infrared ahsorpt,iori barids arid their dichroism were interpreted. Almost all the calculated vibrations have their correspo
Vibrational spectrum of cyclic tetra-L-alanine
β Scribed by V. D. Gupta; R. D. Singh
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1972
- Tongue
- English
- Weight
- 436 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0006-3525
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β¦ Synopsis
A normal coordinate analysis for cyclic tetra-Lalanine molecule is reported. A comparison of amide modes and other low-frequency vibrations sensitive to conformational changes is made with t.hose in poly-Lalanine. Intramolecular coupling coefficients are calculated using perturbation treatment.
π SIMILAR VOLUMES
Polarized ir and Raman spectra have been obtained on oriented films of a-helical poly(L-alanine) (a-PLA) and its N-deuterated derivative. These improved spectra permit a more complete assignment of observed bands to A-, E 1 -, and E 2 -species modes. A new empirical force field has been refined, bas
The laser-excited Raman vibrational spectrum of poly-L-alanine has been obtained. The Raman spectrum is compared with the infrared spectrum and vibrational frequencies calculated from normal coordinate analysis. The symmetric modes of the a-helix appear with strong intensity in the ltaman spectrum.
## Abstract Vibrational CD (VCD) and ir absorption data are reported for a series of films of Bocβ(LβAla)~__n__~βOMe homoβoligopeptides (__n__ = 3β7) in the amide I and A regions. The data evidenced a sharp change between __n__ = 3 and __n__ = 4, which parallels the onset of Ξ²βstructure formation,