## Abstract The far infrared spectra of poly(L‐proline) I (190–35 cm^−1^) and II (400–35 cm^−1^) were obtained in the solid state at both 300° and 110°K. A significant difference in the region below 100 cm^−1^ was observed. A very intense band located at 60 cm^−1^ in the infrared spectrum of form I
Equilibrium and kinetic studies of the cooperative I ⇌ II transition in poly-L-proline
✍ Scribed by Jürgen Engel
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1966
- Tongue
- English
- Weight
- 240 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
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 left-handed helix having all peptide bonds in the trans configuration, and is stable in water, acetic acid, formic acid, and benzyl alcoh01.~~~
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