含羟基偶氮类介晶化合物的合成及相变行为研究

通过醚化、还原、重氮化等反应，设计合成了一系列通式为HOC_nH_2nC₆H₄N=NC₆H₄OC₂H₅(n=2 ,4 ,6 ,8,10 )的含羟基偶氮类化合物。通过¹H-NMR和IR等方法，对该系列化合物的结构进行了表征。并通过DSC检测，考察了柔性链上碳原子数对介晶相态、清亮点温度和相转变温度的影响。结果表明，当柔性末端基上的碳原子数为偶数时，随着碳原子数的增加，该类化合物逐渐由双变态介晶转变为单变态介晶，除n=10外，清亮点温度逐渐降低。文章用W.H.Deieu理论对清亮点的变化给出了相应的解释。

Synthesis of azoic mesomorphic compounds containing hydroxyl groups and their phase behavior

A new series of azoic mesomorphic compounds (OHC n H 2 n C 6H 4N NC 6H 4OC 2H 5( n =2,4,6,8,10))containing hydroxyl groups were synthesized through etherification, reduction and diazo reactions. The structures of these compounds were characterized by the methods of 1H NMR and IR. The influence of the number of cabon atoms in the flexible chains on their mesomorphic state, clear temperature and phase transition temperature was studied by the method of DSC. The result indicates that these compounds transform from di metamorphosis mesomorphase to mono metamorphosis mesomorphase with increasing number of carbons( n =2,4,6,8,10), and the clear temperature decreases gradually except n =10. The change of the clear temperature was explained by W.H.Deieu theory.