NMR Study of a Bimesogenic Liquid Crystal with Two Nematic Phases

被引：3

作者：

Burnell, E. E. ^{[1
]}

Dong, R. Y. ^{[2
]}

Kohlmeier, A. ^{[3
]}

Tamba, M. G. ^{[3
]}

Welch, C. ^{[3
]}

Mehl, G. H. ^{[3
]}

机构：

[1] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada

[2] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[3] Univ Hull, Dept Chem, Kingston Upon Hull HU6 7RX, N Humberside, England

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2015年 / 610卷 / 01期

基金：

加拿大自然科学与工程研究理事会; 英国工程与自然科学研究理事会;

关键词：

MOLEKULAR-STATISTISCHE THEORIE; KRISTALLINFLUSSIGEN PHASE; MOLECULAR-STRUCTURE; GENETIC ALGORITHMS; ORDER PARAMETERS; SPECTRA;

D O I：

10.1080/15421406.2015.1025211

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Recent interest in bimesogenic liquid crystals showing two nematic phases has led us to investigate the nematic mean-field interactions in these nematic phases by using rigid solutes as probes. The nematic potential that is modelled by two independent Maier-Saupe terms is successful in fitting the observed dipolar couplings (order parameters) of para-, meta- and ortho-dichlorobenzene solutes in both the nematic phases of 39wt% of 4-n-pentyl-4 '-cyanobiphenyl (5CB) in alpha,omega-bis(4-4 '-cyanobiphenyl)nonane (CB_C9_CB) to better than the 5% level. The derived liquid-crystal potential parameters G(1) and G(2) for each solute in the N and N-tb phases will be discussed. The most interesting observation is that G(1) (associated with size and shape interactions) is almost constant in the N-tb phase, whereas G(2) (associated with longer-range electrostatic interactions) has large variation, even changing sign.

引用

页码：100 / 107

页数：8

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