以4'-(4-(三氟甲基苯甲酸基)联苯)羧酸(F)为液晶基元,分别以1,2-丙二醇(PD)、1,2,4-丁三醇(BT)、异山梨醇(ISO)和胆甾醇(CH)为手性基元,采用N,N'-二环己基碳化二亚胺/4-二甲氨基吡啶(DCC/DMAP)成酯法合成了4个液晶化合物,即FPD、FBT、FIS和FCH.通过核磁共振、变温X射线衍射等手段对所合成的手性液晶的分子结构及其有序排列进行了研究.结果表明,手性基团的加入降低了液晶分子排列的有序度:F的分子排列形式为近晶相中有序度较高的近晶B(SB)型,手性基元PD使FPD形成了手性近晶A(SA*)的单分子层状排列;手性基元BT使液晶FBT产生了手性近晶C(Sc*)的螺旋型的层状有序排列;手性基元ISO和CH使液晶FIS、FCH产生了胆甾相的螺旋排列.随着手性基元旋光度的加大,FBT、FIS、FCH都呈现出了螺旋排列方式.
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