3,5-Dialkoxy Substituted Triphenyl-tristriazolotriazines: Fluorescent Discotic Liquid Crystals
3,5-Dialkoxy Substituted Triphenyl-tristriazolotriazines: Fluorescent Discotic Liquid Crystals
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DOI：
10.1080/15421406.2015.1025210
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发表时间：
2015-03-24
影响因子：
0.7
通讯作者：
Detert, Heiner
中科院分区：
文献类型：
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作者：
Rieth, Thorsten;Glang, Stefan;Detert, Heiner
以相应的苯基四氮唑和三聚氯氰为原料，合成了三重3，5-二烷氧基苯基取代的三氮唑三嗪。这些星形化合物是盘状液晶，形成广泛而稳定的热致中间相。用差示扫描量热法和偏光显微镜研究了聚合物的热行为。随着侧链长度的增加，相变温度降低，这种影响对于结晶到中间相的转变比对清除温度的影响更明显。取向样品的X射线衍射谱表明，中间相为六方柱状结构。所有的TTTS都在紫外区发射出强烈的荧光。
Tristriazolotriazines with a threefold 3,5-dialkoxyphenyl substitution were prepared from the corresponding phenyltetrazoles and cyanuric chloride. These star-shaped compounds are discotic liquid crystals that form broad and stable thermotropic mesophases. The thermal behaviour was studied by DSC and polarizing optical microscopy. An increasing length of the side chains reduces the phase transition temperatures, this effect is more pronounced for the crystalline to mesophase transition than for the clearing temperature. XRD on an oriented sample revealed a hexagonal columnar structure for the mesophase. All TTTs emit a strong fluorescence in the UV-violet region.