A Comparison of the Conformational Distributions of the Achiral Symmetric Liquid Crystal Dimer CB7CB in the Achiral Nematic and Chiral Twist-Bend Nematic Phases

被引：76

作者：

Emsley, James W. ^{[2
]}

Lelli, Moreno ^{[1
]}

Lesage, Anne ^{[1
]}

Luckhurst, Geoffrey R. ^{[2
]}

机构：

[1] Univ Lyon, UCB Lyon 1, Ctr RMN Tres Hauts Champs, CNRS,ENS Lyon, F-69100 Villeurbanne, France

[2] Univ Southampton, Sch Chem, Southampton SO17 1BJ, Hants, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2013年 / 117卷 / 21期

关键词：

ORIENTATIONAL ORDER PARAMETERS; NMR-SPECTROSCOPY; DIPOLAR COUPLINGS; ALKYL CHAINS; MOLECULES; COMPOUND; SOLVENTS; SYSTEMS;

D O I：

10.1021/jp4001219

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The sets of residual dipolar couplings between carbon and hydrogen nuclei obtained from the proton-encoded C-13 2D NMR experiment are used to investigate the conformational changes which occur when the achiral symmetric liquid crystal dimer CB7CB changes from the achiral nematic to the chiral twist-bend nematic phase. It is found that these changes are a consequence of the chirality of the twist-bend nematic phase, rather than being the driving force for the stability of this phase.

引用

页码：6547 / 6557

页数：11

共 30 条

[1]

[Anonymous], 2004, Gaussian 03 Revision E.01

[2] The Chirality of a Twist-Bend Nematic Phase Identified by NMR Spectroscopy [J].

Beguin, Laetitia ;

Emsley, James W. ;

Lelli, Moreno ;

Lesage, Anne ;

Luckhurst, Geoffrey R. ;

Timimi, Bakir A. ;

Zimmermann, Herbert .

JOURNAL OF PHYSICAL CHEMISTRY B, 2012, 116 (27) :7940-7951

[3]

Brown J. M., 2003, ROTATIONAL SPECTROSC, P145

[4] Measurement of carbon-proton dipolar couplings in liquid crystals by local dipolar field NMR spectroscopy [J].

Caldarelli, S ;

Hong, M ;

Emsley, L ;

Pines, A .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (48) :18696-18701

[5] Phase behavior and properties of the liquid-crystal dimer 1",7"-bis(4-cyanobiphenyl-4′- yl) heptane: A twist-bend nematic liquid crystal [J].

Cestari, M. ;

Diez-Berart, S. ;

Dunmur, D. A. ;

Ferrarini, A. ;

de la Fuente, M. R. ;

Jackson, D. J. B. ;

Lopez, D. O. ;

Luckhurst, G. R. ;

Perez-Jubindo, M. A. ;

Richardson, R. M. ;

Salud, J. ;

Timimi, B. A. ;

Zimmermann, H. .

PHYSICAL REVIEW E, 2011, 84 (03)

[6] THE CONFORMATIONS ADOPTED BY ALKYL CHAINS IN ALPHA,OMEGA-BIS(ARYL)ALKANES IN LIQUID-CRYSTALLINE PHASES [J].

CHEUNG, STW ;

EMSLEY, JW .

LIQUID CRYSTALS, 1993, 13 (02) :265-282

[7] On the spontaneous symmetry breaking in the mesophases of achiral banana-shaped molecules [J].

Dozov, I .

EUROPHYSICS LETTERS, 2001, 56 (02) :247-253

[8] The structure and conformation of a mesogenic compound between almost zero and almost complete orientational order [J].

Emsley, J. W. ;

De Luca, G. ;

Lesage, A. ;

Merlet, D. ;

Pileio, G. .

LIQUID CRYSTALS, 2007, 34 (09) :1071-1093

[9] Tetraethyl stannane: structure, conformations, and orientational order when dissolved in a nematic liquid crystalline solvent [J].

Emsley, J. W. .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2006, 8 (32) :3726-3731

[10]

Emsley J. W., 1996, ENCY NUCL MAGNETIC R, P2788

← 1 2 3 →