Abstract

Four dichiral liquid crystals with one perfluoroalkyl chain and two lactate groups were synthesized. They all exhibit an enantiotropic SmA phase. An enantiotropic SmC_d* phase was identified in a pair of enantiomers. Their optical activity was mainly controlled by the chirality of the lactate residue near mesogenic core. These liquid crystals could self-assemble into twisted nanoribbons or helical nanofibers. The stacking handedness of mesogenic cores and the handedness of nanoribbons/nanofibers were also dominated by the chirality of lactate group near mesogenic core. This “core determination” phenomenon was proposed to originate from the π–π stacking among mesogenic cores.

摘要

合成了四种具有一个全氟烷基链和两个乳酸盐基团的二手性液晶。它们都表现出对映体 SmA 相。在一对对映体中鉴定出对映体SmC _{d * 相。}它们的光学活性主要受介晶核附近乳酸残基的手性控制。这些液晶可以自组装成扭曲的纳米带或螺旋纳米纤维。介晶核的堆叠旋向性和纳米带/纳米纤维的旋向性也受介晶核附近乳酸基团手性的支配。这种“核决定”现象被认为起源于介晶核之间的 π-π 堆积。