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Synthesis and Mesomorphic Properties of Tolan-type Liquid Crystals Containing Terminal Cyano Group

LIU Ke-gang, LI Heng-feng, WANG Kan, WEN Jian-xun (Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China E-mail: wenjianxun@pub. sioc. ac. cn)  
Two series of tolan-type liquid crystals containing terminal cyano group were synthesized. Their phase transition temperatures were also measured by texture observation with a polarizing microscope and confirmed by DSC.All compounds only exhibit a nematic phase. Their mesomorphic properties and fluoro-substituents effect were studied in detail.
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