Abstract
Poly(ɛ-p-toluenesulfonyl l-lysine) was synthesized by the N-carboxyanhydride method. The molecular conformation was the right-handed α-helix in helicogenic solvents and in the solid state. The crystal structure was hexagonal with the unit-cell dimension a=1.680 nm and the unit height h=0.1498 nm. The x-ray structure analysis clarified that the side chains intervened mutually between neighboring helices. The glass transition temperature associated with the side-chain motion was about 60 °C and much higher than those of similar polypeptides. The thin solid film exhibited the extrinsic circular dichroism due to the side chain, which was induced by a chiral array of the side chains.
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