Liquid-crystalline perylene tetracarboxylic bisimide derivatives bearing heptamethylcyclotetrasiloxane moieties have been synthesized. Compound 2 bearing four heptamethylcyclotetrasiloxane moieties exhibits a rectangular columnar phase at room temperature. In the columnar phase, the cyclotetrasiloxane rings interdigitate into neighbouring columns and their interaction promotes the formation of the columnar mesomorphic structure. A time-of-flight measurement reveals that the electron mobility in the columnar phase of compound 2 is on the order of 10−2 cm2 V−1 s−1 at room temperature. Compound 2 is soluble in various organic solvents except for alcohol.
                                    我们合成了含有七甲基环四
硅氧烷分子的液晶包烯四
羧酸二
亚胺衍
生物。含有四个七甲基环四
硅氧烷分子的化合物 2 在室温下呈矩形柱状相。在柱状相中,环四
硅氧烷环相互咬合成相邻的柱状,它们之间的相互作用促进了柱状介形结构的形成。飞行时间测量显示,在室温下,化合物 2 柱状相中的电子迁移率约为 10-2 cm2 V-1 s-1。除
酒精外,化合物 2 可溶于各种有机溶剂。