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A vibrational study of poly (L-proline) I and II in the far infrared

✍ Scribed by John F. Rabolt; William Wedding; Kenneth W. Johnson

Publisher
Wiley (John Wiley & Sons)
Year
1975
Tongue
English
Weight
421 KB
Volume
14
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

The far infrared spectra of poly(L‐proline) I (190–35 cm^βˆ’1^) and II (400–35 cm^βˆ’1^) were obtained in the solid state at both 300Β° and 110Β°K. A significant difference in the region below 100 cm^βˆ’1^ was observed. A very intense band located at 60 cm^βˆ’1^ in the infrared spectrum of form II has no counterpart in form I. This indicates the sensitivity of low‐frequency vibrations to the difference in conformation assumed by both forms in the solid state.

Additional bands observed in this study are correlated with ir and Raman data previously reported and tentative assignments are made using the results of normal mode calculations (in the single‐chain approximation) which have been reported.

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