Asymmetric induction in the preparation of helical receptor-anion complexes: Ion-pair formation with chiral cations

Yohei Haketa, Yuya Bando, Kazuto Takaishi, Masanobu Uchiyama, Atsuya Muranaka, Masanobu Naito, Hiroshi Shibaguchi, Tsuyoshi Kawai, Hiromitsu Maeda

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Asymmetry through ion pairing: Upon addition of chloride and bromide ions, as chiral ammonium salts, to solutions of pyrrole-based π-conjugated linear oligomers, helical structures form with asymmetric induction, which is guided by the formation of diastereomeric ion pairs with chiral counter cations (see picture). These ions pairs exhibit circular dichroism (CD) and strong circularly polarized luminescence (CPL) with glum values of greater than 0.1.

Original languageEnglish
Pages (from-to)7967-7971
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number32
Publication statusPublished - Aug 6 2012
Externally publishedYes



  • anion binding
  • chirality
  • chiroptical properties
  • helical structures
  • ion pairs

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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