Chiral dopants with a spiro structure for nematic liquid crystals were synthesized from optically active 3,3'-(4H,4'R)-spirobi(2H-naphtho[1,2-b]pyran)-6,6'-dicarboxylic acid, and their helical twisting power (HTP) values were evaluated. Chiral dopants having the S configuration induced minus helices in the host nematic liquid crystals. It was found that the novel ester-linked spiro chiral dopants exhibited
用于向列液晶的具有螺结构的手性掺杂剂由光学活性的 3,3'-(4H,4'R)-螺二(2H-
萘并[1,2-b]
吡喃)-6,6'-二
羧酸合成,并评估了它们的螺旋扭曲力 (HTP) 值。具有 S 构型的手性掺杂剂在主体向列液晶中诱导负螺旋。发现新型酯连接的螺手性掺杂剂表现出大的摩尔 HTP 值。特别是,在侧链部分具有两个
嘧啶结构的手性掺杂剂显示出最高的摩尔 HTP 值,为 62.1 μm -1 mol -1 kg。相比之下,醚连接的手性掺杂剂显示出相对较小的摩尔 HTP 值。