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Citation: ZHANG Shu-Yuan, HE Ke-Ke, ZHENG Shi-Jun, WANG Yong-Xin, ZHANG Bao-Guo, LI Zi-Fa. Synthesis and Properties of Schiff Base Crown Ether Liquid Crystals[J]. Chinese Journal of Applied Chemistry, ;2005, 22(3): 272-277. shu

Synthesis and Properties of Schiff Base Crown Ether Liquid Crystals

1.
a Department of Chemistry, Zhengzhou University, Zhengzhou 450052;
2.
b College of Materials Engineering, Zhengzhou University, Zhengzhou 450052

Corresponding author: LI Zi-Fa,
Received Date: 20 May 2004
Available Online: 18 August 2004
Fund Project: 国家自然科学基金(29974026) (29974026)河南省自然科学基金(0211021100) (0211021100)河南省教育厅自然科学基金(20021500004)资助项目 (20021500004)

A series of novel Schiff base crown ether liquid crystals were synthesized from intermediates 4-(4'-alkoxylbiphenyl-4-carboxyl) benzaldehyde and diaminodibenzo-15-crown-5 in yields of 95.2%~96.7%,and their structures and properties were characterized by elemental analysis,polarimetry,¹H NMR,IR,MALDI-TOF-MS,DSC and polarizing optical microscopy with a heating stage.It was found that end products 6Ⅰ and 6Ⅱ formed liquid crystalline phase when heated to their melting points.In their liquid crystalline state,typical chiral smectic C phase,smectic phase,cholesteric phase,and nematic phase textures can be observed.The smectic phase temperature range increases,but the smectic-nematic transition temperature and nemetic phase temperature rang decrease with the increasing of the carbon number of end alkoxy groups,and the melting point (T_m) and isotropization temperature (T_i) decrease gradually.
- Schiff base,
- crown ether,
- thermotropic liquid crystal,
- Synthesis
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