酰胺基西夫碱化合物的合成及其相态行为

设计合成了一系列通式为CH₃CONH—C₆H₄N=CH—C₆H₄—OC_nH_2n+1(n=1,2,4,6,12)的含酰胺基的西夫碱化合物。通过熔点测定、¹H-NMR和IR等方法，对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的影响。结果表明，当碳原子数n≥ 4时，随着碳原子数的增加，介晶相清亮点温度 (T_cl)逐渐降低，介晶相温度区间 (ΔT)逐渐变窄。

Synthesis and phase behavior of schiff bases with amide group

The synthesis and characterization of a new kind of liquid crystals derived from aniline were reported. The influence of the length of the flexible end-group on the liquid crystalline properties was studied. The compounds (n=4, 6, 12) show a mesomorphic phase and higher thermostability. And in this series, the DSC analysis also indicates that the isotropic temperature decreased with increasing number of carbons. At the same time, the transition enthalpy from crystalline state to liquid crystalline presents the same tendency. Their chemical structures were determined by 1H-NMR and IR. The crystalline behavior of them was characterized by DSC.