Effect of lateral fluoro substituents of rodlike tolane cyano mesogens   on blue phase temperature ranges

doi:10.1039/c2sm26807h

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	Effect of lateral fluoro substituents of rodlike tolane cyano mesogens on blue phase temperature ranges
	Li, Birong ; He, Wanli ; Wang, Ling ; Xiao, Xia ; Yang, Huai
刊名	软性材料
	2013
关键词	CHIRAL LIQUID-CRYSTALS TRANSITION-TEMPERATURES SYSTEMS RADII
DOI	10.1039/c2sm26807h
英文摘要	Several kinds of tolane cyano derivatives with different lateral fluoro substituents are doped with chiral additives to induce the blue phase (BP). Fluoro substituents are found to exert a great effect on the BP ranges for biphenyl mesogens. The laterally difluorinated compounds exhibit wider BP ranges than their corresponding mono-fluorinated homologues when equal chiral dopant is added, while the non-fluorinated compounds show direct isotropic (Iso) to chiral nematic (N-star) transitions, even in highly chiral systems. By adjusting the concentrations of the chiral dopant ISO(6OBA)(2) in the fluorinated liquid crystals, the BP ranges can be broadened to more than 12 degrees C. Competition between the steric repulsions caused by the lateral fluoro substituents and pi-pi interactions of the aromatic cores is supposed to be the main factor that leads to the above results. Apart from this, a weak C-H center dot center dot center dot F interaction may have also been conducive to the BP stabilization.; Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Multidisciplinary; Polymer Science; SCI(E); EI; 13; ARTICLE; 4; 1172-1177; 9
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/228260]
专题	工学院
推荐引用方式 GB/T 7714	Li, Birong,He, Wanli,Wang, Ling,et al. Effect of lateral fluoro substituents of rodlike tolane cyano mesogens on blue phase temperature ranges[J]. 软性材料,2013.
APA	Li, Birong,He, Wanli,Wang, Ling,Xiao, Xia,&Yang, Huai.(2013).Effect of lateral fluoro substituents of rodlike tolane cyano mesogens on blue phase temperature ranges.软性材料.
MLA	Li, Birong,et al."Effect of lateral fluoro substituents of rodlike tolane cyano mesogens on blue phase temperature ranges".软性材料 (2013).