摘要
合成了９种具Ｌ－氨基酸衍生物结构的介晶化合物（Ｉ－Ⅲ，Ⅳａｂ，Ⅴａ，ｂ，Ⅵａ，ｂ）、４种氨基酸衍生物（Ａ１－４）和６种介晶化合物（Ｍ１－６）．新化合物（Ⅰ－Ⅲ，Ⅳａ，ｂ，Ⅴａ，ｂ，Ⅵａ，ｂ，Ａ４，Ｍ３－６）的化学结构通过ＩＲ、１ＨＮＭＲ和元素分析证实；并用偏光显微观察和ＤＳＣ分析研究了其相变行为，结果表明有８种化合物（Ｍ３－６，Ⅵａ，ｂ，Ⅴｂ，Ⅵｂ）呈现液晶相变。测定了它们的比旋光度。通过Ｘ射线衍射研究了化合物Ⅵｈ１２０～１３０℃和Ⅵｂ１７０～１８０℃的近晶结构，Ⅵｂ显，Ⅵｂ呈。测定了化合物Ⅳｂ的电滞回线，证明其具铁电性。
Nine mesogenic compounds(I-Ⅲ, Ⅳa,b,Va,b,Ⅵa,b) with the structure of Lamino acid derivative, four L-amino derivatives (A1-4) and six mesogenic compounds (M1-6) were synthesized.The chemical structure of new compounds (I-Ⅲ,Ⅳa,b,Va,b,Ⅵa,b,A4 and M3-6)were confirmed by IR, 1H NMR and elemental analysis.Their phase behavior was also investigated by using differential scanning calorimetry ( DSC) and polarizing microscopy, The resultis show that eight compounds(M3-6,Ⅳa,b,Vb and Ⅵb) exhibit the liquid crystalline plase transtion temperatures,The specific rotation of the compounds was also determined.X-Ray diffraction had been used to investigate smectic structure of two compounds,the results show that compounds(Ⅳb,Ⅵb) exhibit Sc and SE respectively.The hysteresis loop of Ⅳ b were determined, it is proved that Ⅵb do have ferroelectricity.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第9期1385-1390,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
液晶
氨基酸
手性
相变行为
Liquid crystalline (LC) , L-Amino acid,Chiral, Synthesis, Phase transition behavior
