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Dr. Yohei Haketa, Yuya Bando, Dr. Kazuto Takaishi, Prof. Dr. Masanobu Uchiyama, Dr. Atsuya Muranaka, Prof. Dr. Masanobu Naito, Hiroshi Shibaguchi, Prof. Dr. Tsuyoshi Kawai and Prof. Dr. Hiromitsu Maeda Asymmetric Induction in the Preparation of Helical Receptor–Anion Complexes: Ion-Pair Formation with Chiral Cations Angewandte Chemie International Edition 51

Article first published online: 28 JUN 2012 | DOI: 10.1002/anie.201202196

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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.

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