Optically active polyamides having (-)-anti head-to-head coumarin dimer component. 2. Chiroptical property in the film state.

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概要

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• The chiroptical property of optically active polyamides (<B>3a–i</B>), derived from (−)-anti head-to-head coumarin dimer (<B>1</B>), was investigated by comparing their UV and circular dichroism (CD) spectra with those of the corresponding model diamides (<B>8a–i</B>) in the film state. The result suggests that the polyamides (<B>3a–c,g</B>) derived from acyclic aliphatic diamines, exist in a random conformation due to the flexibility of the diamine components. The polyamides (<B>3d</B>,<B>h</B>), consisting of piperazine, are assumed to be in a rod-like conformation, resulting from their rigid and fixed main chains. The polyamides (<B>3e</B>,<B>f</B>,<B>i</B>), prepared from aromatic diamines, show reversed and split Cotton effects at 270–300 nm in comparison with those of model diamides. This phenomenon is interpreted by the formation of an ordered conformation of macromolecular asymmetry.

• 公益社団法人 日本化学会の論文

著者

• Yonezawa Noriyuki

  Department Of Chemistry Gunma University

• Saigo Kazuhiko

  Department Of Chemistry And Biotechnology Faculty Of Engineering The University Of Tokyo

• Chen Yun

  Department Of Microbiology And Immunology Nanjing Medical University

• Hasegawa Masaki

  Department Of Materials Science And Technology Faculty Of Engineering Toin University Of Yokohama

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