Abstract

We present the synthesis and liquid crystalline properties of four sets of diphenyl-1,3,4-oxadiazole based compounds (Sets 1–4). The influence of side chain and lateral fluorinations is discussed. In this study, side chain fluorination (Sets 2 and 3) induces liquid crystalline properties, while lateral fluorination (Set 4) has not induced mesogenic properties. Compounds with either one or two semifluorinated side chains are smectic mesogens (SmC and/or SmA). A comparison among the diphenyl-1,3,4-oxadiazole, biphenylyl-1,3,4-oxadiazole, diphenyl-1,3,4-thiadiazole, and the biphenylyl-1,2,4-oxadiazole cores, which we have previously reported, is discussed.

摘要

我们介绍了四组基于二苯基-1,3,4-恶二唑的化合物（第 1-4 组）的合成和液晶性质。讨论了侧链和侧向氟化的影响。在本研究中，侧链氟化（第 2 组和第 3 组）诱导液晶性质，而侧链氟化（第 4 组）没有诱导介晶性质。具有一个或两个半氟化侧链的化合物是近晶介晶（SmC 和/或 SmA）。二苯基-1,3,4-恶二唑、联苯基-1,3,4-恶二唑、二苯基-1,3,4-噻二唑和联苯基-1,2,4-恶二唑核之间的比较，我们有以前报道过，讨论过。