ISSN:
0006-3525
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Far-infrared spectra were measured for the sequential copolymers of amino acids with alkyl group side chains. The analysis of the spectra showed that (L-Ala-L-Ala-Gly)n, (L-Ala-Gly)n, (L-Ala-Gly-Gly)n, (L-Val-L-Ala-L-Ala)n, and (L-Val-L-Ala)n, have the antiparallel pleated sheet structures and that the backbone conformations of (L-Val-L-Val-L-Ala)n and (L-Val-L-Val-Gly)n are the same as that of poly-L-valine. The far-infrared bands characteristic of the antiparallel pleated sheet structure were assigned on the basis of the result of the normal coordinate analysis of poly-L-alanine with this structure. The intersheet and interchain spacings of the sequential copolymers with the antiparallel pleated sheet structure were determined from the x-ray powder-diffraction patterns of these samples.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/bip.1972.360110806
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