Abstract
β Poly(L-valine) gave an excellent fiber photograph, and its crystal and molecular structures were determined on the basis of 72 X-ray intensity data. A molecular structure was constructed using the equations for helical parameters as functions of empirical internal coordinates. The crystal structure was refined by the R-value-map and least-squares methods with three parameters defining the packing scheme of the molecules. The crystal data: P212121, a=4.80, b=19.14, c=6.59 Å. The final R value was 0.192. The crystal structure is fundamentally the same β-pleated sheet as that of poly(L-alanine). However, the molecule shows a considerable contraction (about 14%) along the fiber axis owing to the presence of a bulky isopropyl side chain.
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Yamashita, O., Ashida, T. Crystal Structure of β Poly(L-valine). Polym J 15, 899–904 (1983). https://doi.org/10.1295/polymj.15.899
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DOI: https://doi.org/10.1295/polymj.15.899