Journal
ACS OMEGA
Volume 6, Issue 28, Pages 18451-18457Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.1c02534
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Funding
- JSPS KAKENHI [17H03035, 20H02809]
- Grants-in-Aid for Scientific Research [17H03035, 20H02809] Funding Source: KAKEN
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The study shows that even an optically inactive compound consisting of a mixture of 21 stereoisomers can form an AP-FCLC phase and exhibit ferroelectricity due to chiral self-sorting in the columnar liquid crystal phase, where molecules with similar stereochemistry form a one-handed helical column and columns with the same helicity gather to form a chiral domain.
An axially polar-ferroelectric columnar liquid crystal (AP-FCLC) phase that exhibits both switching and maintenance of the macro-polarity in the column axis direction has been achieved in an N,N'-bis(3,4,5-trialkoxyphenyl)urea compound (rac-1) prepared from (+/-)-citronellyl bromide. Although it had been thought that chirality is necessary to achieve the AP-FCLC phase from our previous study, the optically inactive compound which is a mixture of 21 stereoisomers, generated an AP-FCLC phase. We confirmed its ferroelectricity and investigated the mechanism for realizing the AP-FCLC phase using optoelectronic experiments, X-ray diffraction, and circular dichroism spectroscopy. As a result, it was suggested that chiral self-sorting occurs in the columnar liquid crystal phase, in which molecules with a similar stereochemistry form a one-handed helical column, and columns with the same helicity gather together to form a chiral domain. Accordingly, we conclude that the optically inactive compound rac-1 also indicates ferroelectricity similar to that of an optically pure urea compound because of chiral self-sorting.
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