Thioindigo-containing organosiloxane liquid crystals with electroclinic properties
Thioindigo-containing organosiloxane liquid crystals with electroclinic properties
复制标题
具有电动性质的含硫靛的有机硅氧烷液晶
DOI：
10.1039/b103755m
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发表时间：
2001
影响因子：
--
通讯作者：
R. Lemieux
中科院分区：
文献类型：
--
作者：
J. Vlahakis;K. Maly;R. Lemieux
合成了两种光学纯的含低聚二硅氧烷和三硅氧烷端基的介晶硫靛衍生物。这些材料分别在120-143°C和110-146°C的温度范围内形成各向异性SmA* 液晶相，并表现出电斜向开关。三硅氧烷衍生物在T-TC = 8 K时的电斜系数为0.4° V−1 µm−1。这些硫靛衍生物的SmA* 相的形成主要是由于硅氧烷和链烷烃部分在层状结构内微偏析成不同子层的趋势。据我们所知，这是文献中报道的含硫靛蓝液晶的前两个例子。
Two mesogenic thioindigo derivatives containing oligomeric di- and trisiloxane end-groups were synthesized in optically pure form. These materials form enantiotropic SmA* liquid crystal phases over temperature ranges of 120–143°C and 110–146°C, respectively, and exhibit electroclinic switching. The electroclinic coefficient for the trisiloxane derivative at T − TC = 8 K is 0.4° V−1 µm−1. The formation of a SmA* phase by these thioindigo derivatives is due primarily to the tendency of siloxane and paraffinic moieties to micro-segregate into distinct sublayers within a lamellar structure. To the best of our knowledge, these are the first two examples of thioindigo-containing liquid crystals to be reported in the literature.