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以2,5-二(4-羟基苯基)-1,3,4-噁二唑为中心基团,亚甲氧基(CH2O)为桥键,烷基(m=3,5,6,7,8,9,10)为末端基团合成了一系列新型弯曲型液晶化合物.通过IR,1H NMR,13C NMR和MS对其结构进行鉴定,经差热扫描仪(DSC)和偏光显微镜(POM)测定其液晶相态.结果表明,目标化合物6a~6g的分子结构正确,其熔点较结构相当的酯类液晶化合物低,除6c外,其它化合物熔点均在100℃以下,都呈现液晶相态,且化合物6d~6g的相态温度范围较宽,并呈现奇偶效应.
With 2,5-bis (4-hydroxyphenyl) -1,3,4-oxadiazole as the central group, methyleneoxy (CH2O) 7,8,9,10), a series of novel bent liquid crystal compounds were synthesized for the terminal groups.The structures of the compounds were characterized by IR, 1H NMR, 13C NMR and MS.They were characterized by differential scanning calorimetry (DSC) and polarized light microscopy POM) .The results show that the molecular structures of the target compounds 6a ~ 6g are correct, their melting points are lower than that of the ester-like liquid crystal compounds with the same structure, and the melting points of all other compounds except 6c are below 100 ℃, State, and the compound 6d ~ 6g phase temperature range is wide, and presents a parity effect.