Abstract
The monoclinic crystal structure of the left-handed ω-helical form of poly[β-(p-methylbenzyl) L-aspartate] was analyzed by X-ray diffraction method. The main chain assumes the 43 helix, but the side-chain arrangement around the axis is deformed from the fourfold symmetry. The structure is statistically disordered in the manner of both arrangements of up and down helices and interpenetration of the methylbenzyl groups. The side-chain conformation is extended essentially with trans about χ1 and gauche about χ2. The distance b(O1δ1, N5)=0.32 nm and the infrared absorption suggests a certain interaction between the main-chain amino group and the side-chain carbonyl group.
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Sasaki, S., Kimura, S. Crystal Structure of the ω-Helical Form of Poly[β-(p-methylbenzyl) L-aspartate]. Polym J 24, 1251–1258 (1992). https://doi.org/10.1295/polymj.24.1251
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DOI: https://doi.org/10.1295/polymj.24.1251