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Synthesis of Mixed Tail Triphenylene Discotic Liquid Crystals： Molecular Symmetry and Oxygen-Atom Effect on the Stabilization of Columnar Mesophases

ISSN号：1001-604X
期刊名称：《中国化学：英文版》
时间：0
分类：O625.155[理学—有机化学;理学—化学] TN104.3[电子电信—物理电子学]
作者机构：[1]College of Chemistry and Material Sciences, Sichuan Normal University, Chengdu, Sichuan 610066, China, [2]National Institute of Advanced Industrial Science and Technology (AIST), Kansai Centre, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
相关基金：Project supported by the National Natural Science Foundation of China （Nos. 50473062, 50673069）, the Sichuan Province Youth Foundation （No. 04-ZQ026-044） and the Research Project of Sichuan Province （No. 05GG009-005）, China.

作者：赵可清[1], 胡平[1], 汪必琴[1], 余文浩[1], 陈红梅[1], 王新玲[1], 清水洋[2]

关键词：苯并菲, 混晶须盘状液晶, 合成, 分子对称性, 氧原子效应, 柱状相稳定, triphenylene, discotic liquid crystal, columnar phase, β-oxygen-atom effect, molecular symmetry

中文摘要：

在 discotic 液体晶体的化学结构的小面值硬币能在他们的 mesomorphism 引起大差别。由包含酉旨链的氧原子 triphenylene 的 alkoxy 外设链代替将导致新奇 mesomorphism。包含 propoxyacetyloxy 和 alkoxy 的一系列混合尾巴 triphenylenes，作为 C18H6 (OCnH2n+1 ) 缩短了 3 (OCOCH2OC3H7 ) 3， n=48，和 hexa (propyloxyacetyloxy ) triphenylene， C18H6 (OCOCH2-OC3H7 ) 6 被综合。三 discogens 的热 gravimetry 分析(TGA ) 证明他们有好热稳定性到 350 湩 e 为止

英文摘要：

Small change in chemical structure of discotic liquid crystals can cause big difference in their mesomorphism. Replacing of the alkoxy peripheral chains of triphenylene by oxygen-atom containing ester chains would result in novel mesomorphism. A series of mixed tail triphenylenes containing propoxyacetyloxy and alkoxy, abbreviated as C18H6（OCnH2n＋1）3（OCOCH2OC3H7）3, n=4-8, and hexa（propyloxyacetyloxy）triphenylene, C18H6（OCOCH2OC3H7）6 were synthesized. Thermal gravimetry analysis （TGA） of three discogens showed that they had good thermal stability till 350 ℃. The mesomorphism was investigated through differential scanning calorimetry （DSC） and polarized optical microscopy （POM）. The preliminary X-ray diffraction （XRD） results of one compound showed that it exhibited ordered hexagonal columnar （Colho） mesophase. These mixed tail triphenylene derivatives possessed much stable Colho mesophase and wider mesophase ranges than their hexaalkoxytriphenylene C18H6（OR）6 and hexaalkanoyloxytriphenylene C18H6（OCOR＇）6 analogues. The asymmetrical compounds 2,6,11-trialkoxy-3,7,10-tri（2-propyloxyacetyloxy）triphenylenes with n=5-8 displayed higher clearing points and wider temperature ranges than their symmetrical isomers 2,6,10-trialkoxy-3,7,11-tri（2-propyloxyacetyloxy）- triphenylenes, while C18H6（OCOCH2OC3H7）6 had the highest clearing point due to the β-oxygen-atom effect.

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