Phase structure and transition behavior of a liquid crystal 5-{[(4 '-heptoxy-4-biphenylyl)oxy]carbonyl}-1-pentyne

doi:10.1016/j.molliq.2005.11.026

CORC > 化学研究所 > 中国科学院化学研究所

	Phase structure and transition behavior of a liquid crystal 5-{[(4 '-heptoxy-4-biphenylyl)oxy]carbonyl}-1-pentyne
	Liu, LJ ; Geng, JX ; Zhou, YC ; Yang, XN ; Li, G ; Zhou, EL ; Lam, JWY ; Tang, BH
刊名	JOURNAL OF MOLECULAR LIQUIDS
	2006-02-15
卷号	124 期号:1-3 页码:96-101
关键词	Structure Liquid Crystalline Phase Waxd
ISSN号	0167-7322
DOI	10.1016/j.molliq.2005.11.026
英文摘要	The phase structures and transition behaviors of a novel liquid crystal compound containing biphenylyl mesogen, 5-{[(4'-heptoxy-4-biphenytyl) oxy]carbonyl}-1-pentyne (A3E'O7), have been investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and wide angle X-ray diffraction (WAXD). In contrast to the published compound 5- {[(4'-heptoxy-4-biphenyl-yl)carbonyl]oxy}-1-pentyne (A3EO7), in which the ester bridge between the mesogenic core and the flexible spacer has different linkage order, A3E'O7 shows strikingly different phase structure and transition behaviors. Overall, A3E'O7 has better packing order and higher transition temperatures. It undergoes three enantiotropic stable liquid crystalline phases which are associated to smectic A (S-A) phase (100.2-98.2 degrees C), smectic C (S-C) phase (98.2-87.2 degrees C) and highly ordered smectic X (S-X) phase (87.2-63.3 degrees C), respectively, till eventual crystallization takes place upon cooling from isotropic state to room temperature. However, A3EO7 only shows monotropic SA (72.4-53.6 degrees C) phase and the metastable monotropic S-C phase provided that the same thermal treatment is applied. We successfully observed the extremely weak transition of S-A to S-C by DSC measurement, which is reported to be normally almost undetectable even by using the most sophisticated instrument due to its second-order transition in nature. Additionally, the pronounced mixed liquid crystalline textures observed in A3E'O7 are not common for the liquid crystal compound having low molar mass. (C) 2005 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000235412700016
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/58693]
专题	中国科学院化学研究所
通讯作者	Li, G
作者单位	1.Chinese Acad Sci, Changchun Inst Appl Chem, Grad Sch, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Liu, LJ,Geng, JX,Zhou, YC,et al. Phase structure and transition behavior of a liquid crystal 5-{[(4 '-heptoxy-4-biphenylyl)oxy]carbonyl}-1-pentyne[J]. JOURNAL OF MOLECULAR LIQUIDS,2006,124(1-3):96-101.
APA	Liu, LJ.,Geng, JX.,Zhou, YC.,Yang, XN.,Li, G.,...&Tang, BH.(2006).Phase structure and transition behavior of a liquid crystal 5-{[(4 '-heptoxy-4-biphenylyl)oxy]carbonyl}-1-pentyne.JOURNAL OF MOLECULAR LIQUIDS,124(1-3),96-101.
MLA	Liu, LJ,et al."Phase structure and transition behavior of a liquid crystal 5-{[(4 '-heptoxy-4-biphenylyl)oxy]carbonyl}-1-pentyne".JOURNAL OF MOLECULAR LIQUIDS 124.1-3(2006):96-101.