Chiral effects of blue phase stabilisation of a binaphthyl derivative
Chiral effects of blue phase stabilisation of a binaphthyl derivative
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DOI：
10.1080/02678292.2010.544416
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发表时间：
2011-03
期刊：
影响因子：
2.2
通讯作者：
Yutaro Kogawa;A. Yoshizawa
中科院分区：
文献类型：
--
作者：
Yutaro Kogawa;A. Yoshizawa
我们最近报道了一种双萘基液晶，它可以在很宽的温度范围内冷却立方蓝相。然而，在加热时，手性向列相取代了蓝色相。为了阐明蓝色相稳定的起源，我们制备了一系列具有两个2，3-二氟-1，4-二苯基苯单元的联萘衍生物，并研究了它们的相变行为和螺旋扭转力。在手性向列相与主体液晶的混合物中，存在蓝色相的联萘衍生物可以诱导螺旋扭转，而其他不含蓝色相的化合物会诱导短的螺旋间距，而不受温度的影响。蓝色相材料的扭转力被认为有两个可能的来源，这两个来源能够稳定相的双扭曲结构。
We have recently reported a binaphthyl liquid crystal exhibiting on cooling a cubic blue phase over a wide temperature range. On heating, however, a chiral nematic phase appeared in place of the blue phase. To elucidate the origin of blue phase stabilisation we have prepared a homologous series of binaphthyl derivatives possessing two 2,3-difluoro-1,4-diphenylbenzene units and have investigated the phase transition behaviour and helical twisting power. A binaphthyl derivative exhibiting the blue phase was found to induce helical twist inversion in a chiral nematic mixture with a host liquid crystal, whereas other compounds without the blue phase induced short helical pitches independently of temperature. The blue phase material is thought to have two possible origins for its twisting power, which are able to stabilise the double-twist structure of the phase.