Adjacent Functional Group Effects on the Assembly of Columnar Liquid Crystals

Resource type
Date created
2020-04-21
Authors/Contributors
Abstract
Although the impact of individual functional groups on the self-assembly of columnar liquid crystal phases has been widely studied, the effect of varying multiple substituents has received much less attention. Herein, we report a series of dibenzo[a,c]phenazines containing an alcohol or ether adjacent to an electron-withdrawing ester or acid. With one exception, these difunctional mesogens form columnar phases. The phase behavior appeared to be dominated by the electron-withdrawing substituent; transition temperatures were similar to derivatives with these groups in isolation. In most instances, the addition of an electron-donating group ortho to an ester or acid suppressed the melting temperature and elevated the clearing temperature, leading to broader liquid crystal thermal ranges. This effect was more pronounced for derivatives functionalized with longer chain hexyloxy groups. These results suggest a potential strategy for controlling the phase ranges of columnar liquid crystals and achieving room temperature mesophases.
Document
Identifier
DOI: 10.1139/cjc-2020-0060
Published as
Zellman, C. O., Vu, D., & Williams, V. E. (2020). Adjacent functional group effects on the assembly of columnar liquid crystals. Canadian Journal of Chemistry, 98(7), 379–385. https://doi.org/10.1139/cjc-2020-0060.
Publication title
Canadian Journal of Chemistry
Document title
Adjacent Functional Group Effects on the Assembly of Columnar Liquid Crystals
Publisher
Canadian Science Publishing
Date
2020
Volume
98
Issue
7
First page
379
Last page
385
Publisher DOI
10.1139/cjc-2020-0060
Copyright statement
Copyright is held by the author(s).
Scholarly level
Peer reviewed?
Yes
Language
Member of collection