Synthesis and Properties of Schiff's Bases Derived from 1,3,4-Thiadiazole as a Mesogenic Unit
摘要:
Some new liquid crystalline 2,5-disubstituted 1,3,3-thiadiazole derivatives incorporating a central group (-CH=N-) have been synthesized by treating 2-amino-5-(4-alkoxyphenyl)-1,3.4-thiadiazole with corresponding p-alkoxybenzaldehyde. Their structures have been characterized with Elementary Analysis, IR, (HNMR)-H-1 and MS, and their properties were determined by using DSC and Texture. All 12 compounds are enantiotropic liquid crystals, and most of them exhibit nematic mesomorphism and broad smectic C mesomorphic ranges. Several compounds show only the smectic C mesophase. By introducing an -OH group into the phenyl ring the thermal stability of the mesophases increases due to the formation of a hydrogen bond.
Synthesis and Properties of Schiff's Bases Derived from 1,3,4-Thiadiazole as a Mesogenic Unit
摘要:
Some new liquid crystalline 2,5-disubstituted 1,3,3-thiadiazole derivatives incorporating a central group (-CH=N-) have been synthesized by treating 2-amino-5-(4-alkoxyphenyl)-1,3.4-thiadiazole with corresponding p-alkoxybenzaldehyde. Their structures have been characterized with Elementary Analysis, IR, (HNMR)-H-1 and MS, and their properties were determined by using DSC and Texture. All 12 compounds are enantiotropic liquid crystals, and most of them exhibit nematic mesomorphism and broad smectic C mesomorphic ranges. Several compounds show only the smectic C mesophase. By introducing an -OH group into the phenyl ring the thermal stability of the mesophases increases due to the formation of a hydrogen bond.
Synthesis and Properties of Schiff's Bases Derived from 1,3,4-Thiadiazole as a Mesogenic Unit
作者:Yan Xu、Wanfang Lu、Zihou Tai
DOI:10.1080/10587250008025240
日期:2000.10.1
Some new liquid crystalline 2,5-disubstituted 1,3,3-thiadiazole derivatives incorporating a central group (-CH=N-) have been synthesized by treating 2-amino-5-(4-alkoxyphenyl)-1,3.4-thiadiazole with corresponding p-alkoxybenzaldehyde. Their structures have been characterized with Elementary Analysis, IR, (HNMR)-H-1 and MS, and their properties were determined by using DSC and Texture. All 12 compounds are enantiotropic liquid crystals, and most of them exhibit nematic mesomorphism and broad smectic C mesomorphic ranges. Several compounds show only the smectic C mesophase. By introducing an -OH group into the phenyl ring the thermal stability of the mesophases increases due to the formation of a hydrogen bond.