Hydrogen-bond stabilized columnar discotic benzenetrisamides with pendant triphenylene groups
作者:Ioan Paraschiv、Kim de Lange、Marcel Giesbers、Barend van Lagen、Ferdinand C. Grozema、Ruben D. Abellon、Laurens D. A. Siebbeles、Ernst J. R. Sudhölter、Han Zuilhof、Antonius T. M. Marcelis
DOI:10.1039/b805283b
日期:——
A series of 1,3,5-benzenetrisamide derivatives with three hexaalkoxytriphenylene pendant groups were prepared, in which the triphenylene groups are connected to the central 1,3,5-benzenetrisamide core through a flexible spacer. The length of this spacer, as well as the size of the ortho-substituent at the triphenylene core, influences the columnar packing of these molecules. All compounds show liquid crystalline behavior with high isotropization temperatures. Different columnar hexagonal phases (Colh, Colhp, Colobl and Colr) have been identified using optical polarization microscopy, differential scanning calorimetry and X-ray diffraction. A chiral 1,3,5-benzenetrisamide derivative forms columnar stacks with a single helical sense, both in an apolar solvent and in a film, as observed by circular dichroism studies. Pulse radiolysis time-resolved microwave conductivity (PR-TRMC) studies show that the high ordering in a Colhp phase results in high charge carrier mobilities. On the other hand, the highest mobility was observed for the chiral compound, which has a Colr ordering.
我们制备了一系列带有三个六烷氧基三亚苯悬垂基团的 1,3,5-苯三胺衍生物,其中三亚苯基团通过一个柔性间隔物与 1,3,5-苯三胺的中心核相连。这种间隔物的长度以及三亚苯核心处正交取代基的大小会影响这些分子的柱状堆积。所有化合物都表现出液晶特性,具有较高的同向温度。利用光学偏振显微镜、差示扫描量热法和 X 射线衍射法,确定了不同的柱状六方相(Colh、Colhp、Colobl 和 Colr)。圆二色性研究观察到,一种手性 1,3,5-苯三酰胺衍生物在无极性溶剂中和薄膜中都形成了具有单一螺旋感的柱状堆叠。脉冲辐射溶解时间分辨微波电导率(PR-TRMC)研究表明,在 Colhp 相中的高有序性导致了高电荷载流子迁移率。另一方面,具有 Colr 有序性的手性化合物的迁移率最高。