Journal
LIQUID CRYSTALS
Volume 44, Issue 4, Pages 666-673Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2016.1229056
Keywords
Smectic liquid crystals; benzo[c]cinnoline; smectic C phase; a wide temperature range; ferroelectricity
Funding
- CREST under the JST Strategic Basic Research Programs - Japan Science and Technology Agency
- Grants-in-Aid for Scientific Research [26630124] Funding Source: KAKEN
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A series of novel calamatic liquid crystals based on a polar benzo[c]cinnoline moiety were efficiently prepared through a facile route. Rich smectic mesophases were induced by the monoalkylated and dialkylated molecular design, including highly ordered smectic mesophases in the rectangular and hexagonal orders. Dialkylated phenylbenzocinnoline derivatives showed a very wide temperature range over 150 degrees C for smectic C (SmC) phase, while the monoalkylated ones only presented the low-ordered mesophases, which exhibited a bilayer structure in crystalline phase. From pronounced reversible redox waves in a cyclic voltammogram and low-lying lowest unoccupied molecular orbital level of about -3.2eV indicated possible electron-transporting behaviour. In addition, a switching behaviour originating from ferroelectricity in SmC* induced by chiral dopant was observed. [GRAPHICS] .
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