Fluorocarbon and Hydrocarbon Benzodioxocycloalkane （C8-Cl0） End Groups： Effects on Mesomorphism  

作　　者：Wanwan Cao Peilian Liu Hongren Chen Yaohang Zhu Rihao Chen Qifang Zhou Zhuo Zeng 

机构地区：[1]College of Chemistry & Environment South China Normal University, Guangzhou, Guangdong 510006, China [2]Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China

出　　处：《Chinese Journal of Chemistry》2013年第7期933-938,共6页中国化学（英文版）

基　　金：Acknowledgement The authors gratefully acknowledge the support of the National Natural Science Foundation of China （No. 21272080）, Department of Science and Technology, Guangdong Province （Nos. 2010A020507001-76, 5300410, FIPL-05-003）, and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.

摘　　要：A new class of benzodioxocycloalkane-based （C8-C10） liquid crystals were prepared. The impact of ring （C8- C10） as end group was investigated. The 8--9 membered ring derivatives, 3a--3b, exhibited the nematic phases （N） The mesomorphic behaviors were weakened with increasing the size of the ring. For the fluorinated medium ring （C8--C10） 3d--3f, it was found only the fluorinated ten membered ring 3f showed the LC phases behaviours. Modification of the ring size with different length alkyl groups and variation of the alkyl to polyfluoroalkyl markedly influenced the properties of these compounds.A new class of benzodioxocycloalkane-based （C8-C10） liquid crystals were prepared. The impact of ring （C8- C10） as end group was investigated. The 8--9 membered ring derivatives, 3a--3b, exhibited the nematic phases （N） The mesomorphic behaviors were weakened with increasing the size of the ring. For the fluorinated medium ring （C8--C10） 3d--3f, it was found only the fluorinated ten membered ring 3f showed the LC phases behaviours. Modification of the ring size with different length alkyl groups and variation of the alkyl to polyfluoroalkyl markedly influenced the properties of these compounds.

关 键 词：FLUORINE HETEROCYCLES liquid crystals MESOPHASES phase transitions 

分 类 号：O647.2[理学—物理化学] TP311.52[理学—化学]