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Vibrational spectra and dispersion curves of poly-L-proline II chain

โœ 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

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โœฆ Synopsis


Abstract

Using Wilson's GFโ€matrix method as modified by Higgs for infinite helical polymers, dispersion curves and the frequency distribution function have been calculated for polyโ€Lโ€proline II chain. Infrared spectrum is obtained and a Ureyโ€Bradley 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.


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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