Terminal Polar Substituent Effect on the Liquid Crystalline Properties of a Series of 4-Octyloxy-<i>N</i>-(4-substituted benzylidene)anilines
作者:Seiichi Miyajima、Takehiko Enomoto、Tomohiro Kusanagi、Takehiko Chiba
DOI:10.1246/bcsj.64.1679
日期:1991.5
Mesomorphic properties are studied on the title compounds where substituents are F, Cl, Br, I, NO2, and CN. Besides the known mesophases, nematic and smectic Ad, in CN and NO2 homologues, stable smectic A and B phases were observed in either of the Cl and Br derivatives. Metastable nematic and smectic A phases were found in F derivative. The effects of terminal polar substituents, stabilization of the smectic A phase by moderately polar substituents, and of the nematic phase by strongly polar substituents, were confirmed.
对取代基为 F、Cl、Br、I、NO2 和 CN 的标题化合物的介观性质进行了研究。除了在 CN 和 NO2 同系物中观察到已知的中间相(向列相和共晶 Ad 相)外,还在 Cl 和 Br 衍生物中观察到了稳定的共晶 A 相和 B 相。在 F 衍生物中发现了可迁移的向列相和共晶 A 相。末端极性取代基的作用得到了证实,中等极性取代基稳定了漆膜 A 相,而强极性取代基则稳定了向列相。