Synthesis,Design and Liquid Crystal Behavior Characterization of a New Bowlic Liquid Crystal of CTV Derivative
- 材料学院－已发表论文 
[中文文摘]碗状的CTV(cyclotriveratrylene)系衍生物主要由三聚法合成,即以香兰素为原料,先制备所需结构的单体衍生物,再进行三聚关环的方法,但该方法无法合成具有较大外围基团的CTV衍生物.新设计了先关环后衍生化的合成路线,成功地合成了一种含较长脂肪链外围基团的新CTV衍生物-CTV-Ⅲ.产物的化学结构经1H-NMR1、3C-NMR、质谱以及元素分析表征验证.通过差示扫描量热法、热台偏光显微镜和小角激光光散射的研究表明,CTV-Ⅲ具有热致液晶性,在其液晶温区内呈现向列相,称为碗状液晶向列相(BN相).CTV-Ⅲ的升温相变序为:G 70℃Cr 87℃BN100℃I.[英文文摘]Normally the bowlic cyclot riverat rylene (CTV) derivatives were synthesized via a multistep sequence from vanillin. This typical method is termed trimerization. But it is difficult to prepare the CTV derivatives with large peripheral groups via this method.An alternative synthesis route ,i. e. derivation af ter ring closure reaction ,was designed to obtain the new CTV derivative2CTV2 Ⅲ. The chemical structure of the product was characterized by means of 1 H-NMR ,13 C-NMR ,mass spectrometry and element analysis. The behaviour of thermotropic liquid crystal of CTV-Ⅲ was observed by differential scanning calorimetry, hot stage coupled polarized optical microscopy and small angle laser light scattering. The mesophase of CTV-Ⅲ was nematic,named bowlic nematic phase (BN ). Its phase transition series of heating were determined to be G 70 ℃Cr 87 ℃BN 100 ℃ I.