单臂冠醚的结构与液晶性质

设计并合成了３个低温冠醚液晶－单臂脂环冠醚液晶，考察了冠醚结构与液晶性质的关系，单臂冠醚液晶分子具有液晶蛋白质应满足长径比大于３，分子具有一定的平面特性和能通过引入手性基团使单臂冠醚液晶分子产生手性近晶相等条件。

Structures and Liquid Crystalline Properties of Monoarmed Crown Ethers

With the aid of CPK molecular model,three monoarmed alicyclic crown ether containing 15-crown-5 unit liquid crystals (1-3) were first synthesized.The transition temperatures were T_(KSc)-7.5 T_(Sc*N) 18.2 T_(NI)23.6 for 1,T_(KI)91.1 T_(IN)82.6T_(NSc*)70.4 T_(Sc*K) 50.3 for 2and T_(KC) 33.87 T_(CN) 46.7 T_(NI) 64.4 for 3. The relationship between structures and properties was investigated,which revealed that monoarmed crown ether liquid crystals could possess mesomorphism not only when the ratio of molecular length to diameter was larger than 3,but also the molecular plarity was required.By inserting chiral group,chiral smetic phases were resulted.It is worth mentioning that the synthesis of crown ether liquid crystals with chirality is hitherto also a new attempt.