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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 and Kim, Byeong-Cheon and Jeon, Sung-Wook and Bae, Jae-Hyun and Walker, Martin and Wilson, Mark and Choi, Suk-Won and Takezoe, Hideo (2017) 'Enhancement of the helical twisting power with increasing the terminal chain length of nonchiral bent-core molecules doped in a chiral nematic liquid crystal.', RSC advances., 7 (4). pp. 1932-1935.

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.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1039/c6ra27158h
Publisher statement:This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Date accepted:21 December 2016
Date deposited:17 January 2017
Date of first online publication:12 January 2017
Date first made open access:No date available

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