Syntheses and Thermal Properties of New Liquid Crystals Bearing a Crown Ether Ring: Cation Binding in the Nematic Phase
1990
A series of crown ether derivatives containing a biphenyl or cholesteryl moiety have been synthesized for the first time. The structural effects of these compounds on the formation of liquid-crystalline phases are discussed. We have found that benzo crown ether derivatives bearing a p-cyano- or p-(octyloxy)biphenyl moiety linked by an ester or ethyne group display a nematic liquid-crystalline phase, and 4'-((cholesteryloxy)carbonyl)benzo crown ethers exhibit a cholesteric phase
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