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Materials 2017, 10(11), 1243; https://doi.org/10.3390/ma10111243

Design of Viologen-Based Liquid Crystals Exhibiting Bicontinuous Cubic Phases and Their Redox-Active Behavior

1
Department of Biotechnology, Tokyo University of Agriculture and Technology Nakacho, Koganei, Tokyo 184-8588, Japan
2
Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST) 4-1-8 Honcho, Kawaguchi 332-0012, Japan
*
Author to whom correspondence should be addressed.
Received: 14 October 2017 / Revised: 25 October 2017 / Accepted: 26 October 2017 / Published: 27 October 2017
(This article belongs to the Special Issue Liquid Crystal-Assisted Advanced Functional Materials)
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Abstract

We have succeeded in developing viologen-based liquid-crystalline materials forming bicontinuous cubic phases. They are composed of amphiphilic zwitterions with a viologen ionic-head-group and sulfonyl-imide-type acids. In the bicontinuous cubic liquid-crystalline assemblies, the ionic-head groups of the amphiphiles align along a gyroid minimal surface, forming a 3D continuous viologen layer. The ionic state of the viologen-moieties can be tuned from a dication state (V2+) to a radical mono cation state (V1+•) by UV irradiation and/or electric field. This redox reaction proceeds in bulk, accompanying the change of their color from colorless to purple. Interestingly, they preserve the 3D molecular assembled structures beyond the redox reaction, which has been confirmed by polarizing optical microscopy and X-ray diffraction measurements. View Full-Text
Keywords: viologen; liquid crystal; bicontinuous cubic phase; gyroid; zwitterion; photo patterning viologen; liquid crystal; bicontinuous cubic phase; gyroid; zwitterion; photo patterning
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kobayashi, T.; Ichikawa, T. Design of Viologen-Based Liquid Crystals Exhibiting Bicontinuous Cubic Phases and Their Redox-Active Behavior. Materials 2017, 10, 1243.

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