Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
90th Commemorative Account: Self-Organization
Dimension-Controlled π-Electronic Ion-Pairing Assemblies
Yohei HaketaHiromitsu Maeda
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2018 Volume 91 Issue 3 Pages 420-436


Ion-pairing assemblies consisting of appropriately designed π-electronic ionic species afford various functional supramolecular assemblies including crystals and soft materials based on the anisotropic orientation of π-electronic ionic species through electrostatic and other weak noncovalent interactions. Organized assemblies comprising π-electronic ionic species as dimension-controlled assemblies provide unique and tunable mesophases and electronic properties. As components of dimension-controlled ion-pairing assemblies, π-electronic ion pairs are important and have been prepared through (i) synthesis of π-electronic units bearing ionic substituents, (ii) synthesis of genuine π-electronic ions, and (iii) complexation of π-electronic receptors and ions. In (ii) and (iii), appropriate ion-exchange processes are necessary. Based on these strategies, fascinating ion pairs and their assemblies have been constructed, resulting in an elucidation of the assembling behaviors of π-electronic ion pairs. In this article, ion-pairing assemblies consisting of precisely designed π-electronic ionic species are described, with a focus on the preparation methods, structures, and properties.

Ion-pairing assemblies consisting of appropriately designed π-electronic ionic species afford various solid-state and soft materials through electrostatic interaction as well as other weak noncovalent interactions. This article summarizes recent progresses in preparation methods of π-electronic ionic species and ion pairs along with the assembling structures and properties of dimension-controlled π-electronic ion-pairing assemblies. Fullsize Image
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