【摘要】 以4’-正烷氧基联苯-4-甲酸和顺(反)-4,4’-双(4-羟基苯基偶氮)二苯并-14-冠-4为中间体,通过溶液缩合反应,合成了一系列偶氮型液晶冠醚.并用元素分析、核磁共振、紫外可见分光光度计、红外光谱、基质辅助激光解析电离飞行时间质谱、示差扫描量热法和偏光显微镜对其进行了表征.随分子末端烷氧基碳原子数增加,化合物4I和4II的熔点(Tm)和液晶态的清亮点(Ti)逐渐降低,液晶态温度范围较宽.更多还原

【Abstract】 A series of azo type liquid crystalline crown ethers were synthesized using the intermediates of 4’-n-alkoxylbiphenyl-4-carboxylic acids and cis(trans)-4,4’-bis(4-hydroxyphenylazo)dibenzo-14-crown-4. Their structures and properties were characterized by elemental analysis, 1H NMR, UV-Vis, IR, MALDI-TOF-MS, DSC and polarizing optical microscopy with a heating stage. For compounds 4I and 4II, both melting point Tm and isotropization temperature Ti were decreased with the increase of the carbon numbers of the end alkoxy groups. However, the temperature range of liquid crystal phase was relatively wide.更多还原