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Enhancement of the helical twisting power with increasing the terminal chain length of nonchiral bent-core molecules doped in a chiral nematic liquid crystal

Jo, Seong-Yong; Kim, Byeong-Cheon; Jeon, Sung-Wook; Bae, Jae-Hyun; Walker, Martin; Wilson, Mark; Choi, Suk-Won; Takezoe, Hideo

Enhancement of the helical twisting power with increasing the terminal chain length of nonchiral bent-core molecules doped in a chiral nematic liquid crystal Thumbnail


Authors

Seong-Yong Jo

Byeong-Cheon Kim

Sung-Wook Jeon

Jae-Hyun Bae

Martin Walker

Suk-Won Choi

Hideo Takezoe



Abstract

In this work, we prepared a series of nonchiral bent-core molecules with different terminal alkoxy chain lengths, and measured the helical twisting power (HTP) of the bent-core molecules doped in a chiral nematic liquid crystal (N*LC). We investigated the doping effect through the colour change and spectral change due to the Bragg (selective) reflection and found that the bent-core molecules with longer alkoxy chains showed stronger HTP under chiral circumstances such as N*LC. Namely, not only the axial conformations at wings linked to the bent central unit but also the length of the alkoxy chains at the terminal positions of the bent-core molecules play an important role in the resulting unusual chiral behaviour. A preliminary stochastic dynamics simulation to determine the distribution of the chirality order parameters was made, being consistent with the present experimental result.

Journal Article Type Article
Acceptance Date Dec 21, 2016
Online Publication Date Jan 12, 2017
Publication Date Jan 12, 2017
Deposit Date Jan 6, 2017
Publicly Available Date Jan 17, 2017
Journal RSC Advances
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 7
Issue 4
Pages 1932-1935
DOI https://doi.org/10.1039/c6ra27158h
Public URL https://durham-repository.worktribe.com/output/1389138

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