Helical structures of N-alkylated poly(p-benzarnide)s

Aya Tanatani, Akihiro Yokoyama, Isao Azumaya, Yoshinori Takakura, Chikashi Mitsui, Motoo Shiro, Masanobu Uchiyama, Atsuya Muranaka, Nagao Kobayashi, Tsutomu Yokozawa

研究成果: Article査読

143 被引用数 (Scopus)

抄録

Poly(p-benzamide)s 1 bearing a chiral side chain on the nitrogen atom were synthesized by chain-growth polycondensation methodology. The polyamides exhibited well-defined molecular weights with narrow polydispersities. Solutions of the polyamides in several organic solvents (CH3CN, CHCl 3, and CH3OH) showed dispersion type CD signals characteristic of coupled-oscillator and much larger as compared with the corresponding monomer. The CD signals were dependent on the temperature and molecular weight of the polyamides but independent of the solvent, as far as examined. An exciton model analysis of the absorption and CD spectra provided a clear-cut picture for the secondary structure of these polyamides in solution that the N-alkylated poly(p-benzamide)s possess a right-handed helical conformation ((P)-helix). In the solid states, the results of X-ray crystallographic analysis of 4-(methylamino)benzoic acid oligomers substantiated that they have a helical conformation with three monomer units per turn.

本文言語English
ページ(範囲)8553-8561
ページ数9
ジャーナルJournal of the American Chemical Society
127
23
DOI
出版ステータスPublished - 2005 6月 15
外部発表はい

ASJC Scopus subject areas

  • 触媒
  • 化学 (全般)
  • 生化学
  • コロイド化学および表面化学

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