新型含酰胺键的噻二唑类液晶的合成  

Synthesis and Properties of New Thiadiazole Liquid CrystallineCompounds with Amide Central Linkages

作　　者：李茂国[1] 商永嘉[1,2] 陆婉芳[3] 王彦广[4] 

机构地区：[1]安徽师范大学化学与材料科学学院 [2]南京大学化学系,南京210093 [3]南京大学化学系 [4]浙江大学化学系

出　　处：《高等学校化学学报》2002年第4期576-580,共5页Chemical Journal of Chinese Universities

基　　金：江苏省科委基金(批准号BJ93043)资助.

摘　　要：合成了以酰胺键为中心桥键的１,３,４－噻二唑衍生物３个系列共１６个新化合物．液晶性质测试表明,它们均为具有高相变温度和宽相变范围的稳定液晶化合物．说明极性的酰胺键有利于介晶性能．比较了端某碳原子数目的多寡对Ｓｃ相相变温度的影响．Sixteen 2, 5-bisphenyl-1, 3, 4-thiadiazoles with amide central linkages were synthesized. Theirchemical structures were analyzed by IR and 1H NMR spectrometry. The liquid crystalline properties weredetermined by POM and DSC. The results show that they are all thermally stability liquid crystals andhave higher phase transition temperatures and wide phase transition temperature ranges. The paper indi-cated that the amide central linkages are more conductive to smectic phase. The effect of the carbon atomnumber of terminal group on mesomorphic properties was discussed.

关 键 词：酰胺键 液晶 合成 衍生物 1 3 4-噻二唑 

分 类 号：O626.25[理学—有机化学] O753.2[理学—化学]