Ferroelectric Liquid Crystals Induced by Atropisomeric Dopants: Dependence of the Polarization Power on the Core Structure of the Smectic C Host
作者:Despina Vizitiu、Carmen Lazar、Brian J. Halden、Robert P. Lemieux
DOI:10.1021/ja990965m
日期:1999.9.1
A series of 11 chiral dopants with an atropisomeric core derived from 4,4‘-dihydroxy-2,2‘,6,6‘-tetramethyl-3,3‘-dinitrobiphenyl were synthesized in optically pure form. These compounds were doped into five different smectic C (SC) liquid crystal hosts to induce a ferroelectric SC* liquid crystal phase, and the reduced polarization Po was measured as a function of the dopant mole fraction xd over the
以光学纯的形式合成了一系列 11 种手性掺杂剂,其具有源自 4,4'-二羟基-2,2',6,6'-四甲基-3,3'-二硝基联苯的阻转异构核。这些化合物被掺杂到五种不同的近晶 C (SC) 液晶主体中以诱导铁电 SC* 液晶相,并且在 0.005 < xd ≤ 0.05 的范围内,测量降低的极化 Po 作为掺杂剂摩尔分数 xd 的函数。发现极化功率 δp 强烈依赖于 SC 主体的核心结构。例如,掺杂剂 (+)-2,2',6,6'-tetramethyl-3,3'-dinitro-4,4'-bis[(4-octyloxybenzoyl)oxy]biphenyl 的 δp 值 <30 nC在苯甲酸苯酯 SC 主体中为 /cm2,在苯基嘧啶 SC 主体中为 1738 nC/cm2;后者是迄今为止文献中报道的最高极化功率值之一。