Assembly of thioether-containing rod-like liquid crystalline materials assisted by hydrogen-bonding terminal carboxyl groups
Assembly of thioether-containing rod-like liquid crystalline materials assisted by hydrogen-bonding terminal carboxyl groups
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DOI：
10.1039/c4ra15300f
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发表时间：
2015-01
期刊：
影响因子：
3.9
通讯作者：
Y. Arakawa;Sungmin Kang;J. Watanabe;G. Konishi
中科院分区：
文献类型：
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作者：
Y. Arakawa;Sungmin Kang;J. Watanabe;G. Konishi
我们设计了一种端羧基和烷硫基的氢键二苯乙炔基分子，试图实现含硫醚的棒状液晶材料。该分子成功地表现出一个稳定的互变中间相，与非氢键的衍生物，包括二苯乙炔和二苯基二乙炔。此外，与具有烷基或烷氧基的类似物相比，它显示出两个显著的特征。首先，烷基硫烷基衍生物的中间相显示出强的长程相关性。其次，烷基硫烷基衍生物的双折射率高度依赖于温度，达到最大值0.36。这些显著的特征被认为是由于硫原子的高极化率和S-S接触。这些发现将有助于设计新型含硫棒状液晶材料。
We designed a hydrogen-bonding tolane-based molecule with terminal carboxyl and alkylsulfanyl groups in an effort to realize thioether-containing rod-like liquid crystalline materials. The molecule successfully exhibits a stable enantiotropic mesophase, in contrast to non-hydrogen bonding derivatives, including tolane and diphenyldiacetylene. In addition, it shows two remarkable characteristics compared to analogues with alkyl or alkoxy groups. First, the mesophase of the alkylsulfanyl derivative shows strong long-range correlation. Second, the birefringence of the alkylsulfanyl derivative is highly temperature-dependent, achieving a maximum value of 0.36. These remarkable characteristics are believed to be due to the high polarisability of sulfur atoms and S–S contacts. These findings will be helpful for the design of novel sulfur-containing rod-like liquid crystalline materials.