Journal
ADVANCED OPTICAL MATERIALS
Volume 8, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202000936
Keywords
asymmetric reaction field; dynamic control of helical sense; helical conjugated polymers; photoinvertible chiral liquid crystals; reversible helical inversion
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology, Japan [20H02818, 19K22221]
- Takahashi Industrial and Economic Research Foundation in Japan
- Grants-in-Aid for Scientific Research [19K22221, 20H02818] Funding Source: KAKEN
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Photoinvertible chiral compounds are synthesized by linking a photoresponsive bisbenzothienylethene moiety with an axially chiral binaphthyl moiety and used as chiral dopants to prepare a photoinvertible chiral nematic liquid crystal (N*-LC) field. Subsequently, electrochemical polymerizations of ethylenedioxythiophene (EDOT) in the N*-LC field to synthesize helical poly(ethylenedioxythiophene)s (H-PEDOTs) are achieved. The H-PEDOTs show not only spiral morphologies resembling the fingerprinted texture of N*-LC in polarizing optical microscope but also bisignate Cotton effects in circular dichroism spectra, indicating the formation of a helically pi-stacked structure in terms of the main chains of H-PEDOT. In addition, the signs of the bisignate Cotton effect are strictly determined by the helicity of the N*-LC. The present N*-LC is the first reaction field exhibiting photoinvertible chirality with extremely high fatigue resistance and serves as an asymmetric medium for electrochemical polymerization, leading to dynamic helicity control of conjugated polymers.
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