Ferroelectric Liquid Crystals Induced by Dopants with Axially Chiral 2,2‘-Spirobiindan-1,1‘-dione Cores
作者:Christopher J. Boulton、Jeremy G. Finden、Eagranie Yuh、Jeffrey J. Sutherland、Michael D. Wand、Gang Wu、Robert P. Lemieux
DOI:10.1021/ja054322k
日期:2005.10.1
The axially chiral dopants (R)-5,5‘-, 5,6‘-, and 6,6‘-diheptyloxy-2,2‘-spirobiindan-1,1‘-dione ((R)-2, -3, and -4) were synthesized in optically pure form, and their absolute configurations were assigned by the exciton chirality method using circular dichroism spectroscopy. These new compounds were doped in four achiral liquid crystal hosts to give chiral smectic C* (SmC*) phases with spontaneous polarizations
轴向手性掺杂剂 (R)-5,5'-、5,6'- 和 6,6'-diheptyloxy-2,2'-spirobiindan-1,1'-dione ((R)-2, -3 , 和 -4) 以光学纯形式合成,它们的绝对构型通过使用圆二色光谱的激子手性方法指定。这些新化合物掺杂在四种非手性液晶主体中,以产生具有自发极化 (PS) 的手性近晶 C* (SmC*) 相,其自发极化 (PS) 随主体的核心结构而变化。由 5,5'-二烷氧基衍生物 (R)-2 诱导的自发极化一致为正,而由 6,6'-二烷氧基衍生物 (R)-4 诱导的自发极化一致为负,并显示出不同的宿主依赖性趋势. 极化功率 (δp) 值范围从 2',3'-difluoro-4-heptyl-4''-nonyl-p-terphenyl (DFT) 中 (R)-2 的 +21 nC/cm2 到 -1037 nC/cm2对于 (R)-4 在 4-(4'-庚基