Carbonyl- and thioether-linked cyanobiphenyl-based liquid crystal dimers exhibiting twist-bend nematic phases
Carbonyl- and thioether-linked cyanobiphenyl-based liquid crystal dimers exhibiting twist-bend nematic phases
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DOI：
10.1016/j.tet.2020.131870
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发表时间：
2021-02-12
期刊：
影响因子：
2.1
通讯作者：
Tsuji, Hideto
中科院分区：
文献类型：
--
作者：
Arakawa, Yuki;Komatsu, Kenta;Tsuji, Hideto
开发了一系列具有奇数烷基间距（n = 3、5、7、9）的酮型液晶（LC）二聚体，即羰基和硫醚连接的氰基苯基弯曲LC二聚体（CBCOnSCB）。CBCOnSCB二聚体（n = 3、5和7）在向列相(n)下方形成扭弯向列相（n - tb）。CBCOnSCB的N- to - N- tb相变温度高于之前报道的对称双（硫醚）连接的CBSnSCB和不对称醚和硫醚连接的CBSnSCB类似物。与可玻璃化的CBSnSCB和CBOnSCB类似物相比，CBCOnSCB倾向于结晶。对CBCO5SCB进行了单晶x射线结构分析。(C) 2020 Elsevier Ltd.版权所有。
A homologous series of ketone-type liquid crystal (LC) dimers, namely carbonyl- and thioether-linked cyanobiphenyl-based bent LC dimers (CBCOnSCB), with odd numbers of alkylene spacers (n = 3, 5, 7, and 9), was developed. CBCOnSCB dimers (n = 3, 5, and 7) formed a twist-bend nematic (N-TB) phase below the nematic (N) phase. The N to N-TB phase-transition temperatures of CBCOnSCB were higher than those of previously reported symmetric bis(thioether)-linked CBSnSCB and asymmetric ether- and thioether-linked CBOnSCB analogs. Compared to the vitrifiable CBSnSCB and CBOnSCB analogs, CBCOnSCB tended to crystallize. Single-crystal X-ray structural analysis of CBCO5SCB was also performed. (C) 2020 Elsevier Ltd. All rights reserved.