title: Unexpected thermally stable, cholesteric liquid-crystalline helical polyisocyanides with memory of macromolecular helicity.
abstract: The achiral sodium salt of poly(4-carboxyphenyl isocyanide) (poly-1-Na) folds into a one-handed helix induced by optically active amines in water. The induced helicity remains when the optically active amines are completely removed, and further modification of the side groups to amide residues is possible without loss of memory of macromolecular helicity. Although the helical poly-1-Na loses its chiral memory at high temperature, helical polyisocyanides modified with achiral primary amines, which no longer have any chiral components, keep their memory perfectly even at 100 degrees C in N,N-dimethylformamide in some cases and exhibit cholesteric liquid-crystalline phases, thus providing a robust scaffold with heat resistance to which a variety of functional groups can be introduced.
authors: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.
authors: Yoko
authors: Y
authors: Hase
authors: Yuuki
authors: Y
authors: Mitsutsuji
authors: Masayoshi
authors: M
authors: Ishikawa
authors: Katsuhiro
authors: K
authors: Maeda
authors: Kento
authors: K
authors: Okoshi
authors: Eiji
authors: E
authors: Yashima
mesh_terms: D000577:Amides; D000588:Amines; D003486:Cyanides / Q000737:chemistry*; D006358:Hot Temperature; D050866:Liquid Crystals; D046911:Macromolecular Substances / Q000737:chemistry*; D008968:Molecular Conformation; D011108:Polymers
chemical_list: D000577:Amides; D000588:Amines; D003486:Cyanides; D046911:Macromolecular Substances; D011108:Polymers