Tetrakis(oxadiazolylphenyl)pyrazines: New St. Andrew's Cross-Shaped Liquid Crystals.
Tetrakis(oxadiazolylphenyl)pyrazines: New St. Andrew's Cross-Shaped Liquid Crystals.
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DOI：
10.1002/cphc.201800936
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
N. Röder;T. Marszalek;D. Limbach;W. Pisula;H. Detert
中科院分区：
文献类型：
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作者：
N. Röder;T. Marszalek;D. Limbach;W. Pisula;H. Detert
通过四重Huisgen反应合成了具有圣安德鲁十字形状的π-共轭分子。四个 2,5-二芳基-1,3,4-恶二唑臂连接到中央吡嗪核。当这些荧光星形装饰有八个烷氧基侧链的边缘时，它们是盘状液晶。根据取代模式，液相宽度在 25 °C 至 250 °C 的宽范围内变化。在液晶相中，分子以典型的六角柱状超分子排列方式组装。
π-Conjugated molecules with the shape of St. Andrew's cross have been synthesized via fourfold Huisgen reaction. Four 2,5-diaryl-1,3,4-oxadiazol arms are attached to a central pyrazine nucleus. These fluorescent stars, when decorated with a rim of eight alkoxy side chains are discotic liquid crystals. Depending on the substitution pattern, the width of the liquid phase varies within a broad range of 25 °C to 250 °C. In their liquid crystalline phase, the molecules assemble in a typical hexagonal columnar supramolecular arrangement.