Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 35, Pages 10946-10949Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b06323
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- JSPS [18H05260, 16K14062]
- JSPS Young Scientist Fellowship
- Grants-in-Aid for Scientific Research [16K14062] Funding Source: KAKEN
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Here, we report the first redox-active chiral dopant D-Fc, which electrically alters its helical twisting power (HTP) for a cholesteric liquid crystalline (LC) medium and quickly changes the reflection color. D-Fc is composed of an axially chiral binaphthyl unit in conjunction with a redox-active ferrocene unit. A cholesteric LC phase of 4'-pentyloxy-4-cyanobiphenyl, doped with D-Fc (3.0 mol %), developed a blue reflection color. When nitrosyl tetrafluoroborate, a one-electron oxidant, was added to this cholesteric LC phase, D-Fc was oxidized to decrease its original HTP value by 13%, so that a green reflection color was developed. In the presence of a supporting electrolyte, the reflection color was electrochemically modulated using a sandwich-type glass cell with indium tin oxide electrodes. In quick response to the applied voltage of +1.5 V, the reflection color changed from blue to green within 0.4 s. When 0 V was applied, the reflection color returned to its original blue color. The D-Fc-doped cholesteric LC is characterized by its fastest electrochemical response and lowest operating voltage among those reported for electrically driven cholesteric LC devices.
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