## Abstract Dispersion curves and frequency distribution for polyโLโhydroxyproline (PLHP) chain were obtained using Wilson's __GF__ matrix method as modified by Higgs. These are compared with those of polyโLโproline II and polyglycine II, which also have threeโfold screw symmetry. Ring and skeletal
Vibrational spectra and dispersion curves of poly-L-proline II chain
โ Scribed by V. D. Gupta; R. D. Singh; A. M. Dwivedi
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1973
- Tongue
- English
- Weight
- 379 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0006-3525
No coin nor oath required. For personal study only.
โฆ Synopsis
Abstract
Using Wilson's GFโmatrix method as modified by Higgs for infinite helical polymers, dispersion curves and the frequency distribution function have been calculated for polyโLโproline II chain. Infrared spectrum is obtained and a UreyโBradley force field, which provides best fit with the observed frequencies, is evaluated. The result are discussed from the viewpoint of the conformational characteristics of forms I and II.
๐ SIMILAR VOLUMES
## Abstract The far infrared spectra of poly(Lโproline) I (190โ35 cm^โ1^) and II (400โ35 cm^โ1^) were obtained in the solid state at both 300ยฐ and 110ยฐK. A significant difference in the region below 100 cm^โ1^ was observed. A very intense band located at 60 cm^โ1^ in the infrared spectrum of form I
In Fig. X lo-" shoiild read [el x 10-4.
The synthetic polymer poly-L-proline exists in two conformational forms, I and 11, the structures of which have been elucidated by x-ray crystallography.'-3 Form I is a right-handed helix with all peptide bonds in the cis configuration, and is stable in pyridine and aliphatic alcohols. Form I1 is a