Two novel monoarmed alicyclic 18-crown-6 liquid crystals were designed and synthesized in an attempt to lower the phase transition temperature of crown ether liquid crystal. They were synthesized by treating hydroxymethyl 18-crown-6- with chloride 4-(4'-n-butoxybenzoyloxy) benzoylate or cholesteryl chlorocarbonate respectively. The phase transition temperatures were determined by DSC and polarized microscopy were found to be as follows: T~K~N, 4.0℃; T~N~I, 33.5℃ for the former and T~K~S, -22.4℃; T~S~N, 6.8℃; T~N~I, 40.1℃ for the later. The characteristics of Y-type LB film were observed from the LB film prepared with equimolecular stearic acid and the new liquid crystal.

Key words: LIQUID CRYSTAL, CROWN ETHER, SYNTHESIS