Enantiotopic discrimination and director organization in the twist-bend nematic phase

被引：55

作者：

Greco, Cristina ^{[1
]}

Luckhurst, Geoffrey R. ^{[2
]}

Ferrarini, Alberta ^{[1
]}

机构：

[1] Univ Padua, Dipartimento Sci Chim, I-35131 Padua, Italy

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

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 36期

关键词：

SPONTANEOUS SYMMETRY-BREAKING; BANANA-SHAPED MOLECULES; LIQUID-CRYSTAL DIMERS; NMR-SPECTROSCOPY;

D O I：

10.1039/c3cp52222a

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：

Extending a molecular field model for the orientational order in the nematic phase, we calculate the H-2-NMR splittings for the achiral solute 8CB-d(2) in the twist-bend nematic phase formed by the achiral liquid crystal dimer CB7CB. We give an explanation for the enantiotopic discrimination observed in the spectra and comparison with experimental data allows us to provide quantitative estimates of the order parameters (pitch and conical angle) that characterize the directormodulation of the twist-bend nematic phase.

引用

页码：14961 / 14965

页数：5

共 23 条

[1] Macroscopic Torsional Strain and Induced Molecular Conformational Deracemization [J].

Basu, Rajratan ;

Pendery, Joel S. ;

Petschek, Rolfe G. ;

Lemieux, Robert P. ;

Rosenblatt, Charles .

PHYSICAL REVIEW LETTERS, 2011, 107 (23)

[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] Is Enantiomer Assignment Possible by NMR Spectroscopy Using Residual Dipolar Couplings from Chiral Nonracemic Alignment Media?uA Critical Assessment [J].

Berger, Robert ;

Courtieu, Jacques ;

Gil, Roberto R. ;

Griesinger, Christian ;

Koeck, Matthias ;

Lesot, Philippe ;

Luy, Burkhard ;

Merlet, Denis ;

Navarro-Vazquez, Armando ;

Reggelin, Michael ;

Reinscheid, Uwe M. ;

Thiele, Christina M. ;

Zweckstetter, Markus .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2012, 51 (33) :8388-8391

[4]

Burnell E.E., 2003, NMR of Ordered Liquids

[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]

Courtieu J., 2002, ENCY NUCL MAGNETIC R, V9

[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] Induced and spontaneous deracemization in bent-core liquid crystal phases and in other phases doped with bent-core molecules [J].

Earl, DJ ;

Osipov, MA ;

Takezoe, H ;

Takanishi, Y ;

Wilson, MR .

PHYSICAL REVIEW E, 2005, 71 (02)

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

Emsley, James W. ;

Lelli, Moreno ;

Lesage, Anne ;

Luckhurst, Geoffrey R. .

JOURNAL OF PHYSICAL CHEMISTRY B, 2013, 117 (21) :6547-6557

[10] Chiral solutes can seed the formation of enantiomorphic domains in a twist-bend nematic liquid crystal [J].

Emsley, James W. ;

Lesot, Philippe ;

Luckhurst, Geoffrey R. ;

Meddour, Abdelkrim ;

Merlet, Denis .

PHYSICAL REVIEW E, 2013, 87 (04)

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