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Title: Heliconical smectic phases formed by achiral molecules

Abstract

Chiral symmetry breaking in soft matter is a hot topic of current research. Recently, such a phenomenon was found in a fluidic phase showing orientational order of molecules - the nematic phase; although built of achiral molecules, the phase can exhibit structural chirality - average molecular direction follows a short-pitch helix. Here in this paper, we report a series of achiral asymmetric dimers with an odd number of atoms in the spacer, which form twisted structures in nematic as well as in lamellar phases. The tight pitch heliconical nematic (NTB) phase and heliconical tilted smectic C (SmCTB) phase are formed. The formation of a variety of helical structures is accompanied by a gradual freezing of molecular rotation. In the lowest temperature smectic phase, HexI, the twist is expressed through the formation of hierarchical structure: nanoscale helices and mesoscopic helical filaments. The short-pitch helical structure in the smectic phases is confirmed by resonant X-ray measurements.

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [2];  [3];  [4];  [4]
  1. Univ. of Aberdeen, King's College, Aberdeen, Scotland (United Kingdom)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Kent State Univ., Kent, OH (United States). Dept. of Physics and Liquid Crystal Inst.
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  4. Univ. of Warsaw (Poland). Faculty of Chemistry
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1433133
Grant/Contract Number:  
AC02-05CH11231; 2016/22/A/ST5/00319; DMR-1411344; DMR-1307674
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Abberley, Jordan P., Killah, Ross, Walker, Rebecca, Storey, John M. D., Imrie, Corrie T., Salamo?czyk, Miros?aw, Zhu, Chenhui, Gorecka, Ewa, and Pociecha, Damian. Heliconical smectic phases formed by achiral molecules. United States: N. p., 2018. Web. doi:10.1038/s41467-017-02626-6.
Abberley, Jordan P., Killah, Ross, Walker, Rebecca, Storey, John M. D., Imrie, Corrie T., Salamo?czyk, Miros?aw, Zhu, Chenhui, Gorecka, Ewa, & Pociecha, Damian. Heliconical smectic phases formed by achiral molecules. United States. doi:10.1038/s41467-017-02626-6.
Abberley, Jordan P., Killah, Ross, Walker, Rebecca, Storey, John M. D., Imrie, Corrie T., Salamo?czyk, Miros?aw, Zhu, Chenhui, Gorecka, Ewa, and Pociecha, Damian. Mon . "Heliconical smectic phases formed by achiral molecules". United States. doi:10.1038/s41467-017-02626-6. https://www.osti.gov/servlets/purl/1433133.
@article{osti_1433133,
title = {Heliconical smectic phases formed by achiral molecules},
author = {Abberley, Jordan P. and Killah, Ross and Walker, Rebecca and Storey, John M. D. and Imrie, Corrie T. and Salamo?czyk, Miros?aw and Zhu, Chenhui and Gorecka, Ewa and Pociecha, Damian},
abstractNote = {Chiral symmetry breaking in soft matter is a hot topic of current research. Recently, such a phenomenon was found in a fluidic phase showing orientational order of molecules - the nematic phase; although built of achiral molecules, the phase can exhibit structural chirality - average molecular direction follows a short-pitch helix. Here in this paper, we report a series of achiral asymmetric dimers with an odd number of atoms in the spacer, which form twisted structures in nematic as well as in lamellar phases. The tight pitch heliconical nematic (NTB) phase and heliconical tilted smectic C (SmCTB) phase are formed. The formation of a variety of helical structures is accompanied by a gradual freezing of molecular rotation. In the lowest temperature smectic phase, HexI, the twist is expressed through the formation of hierarchical structure: nanoscale helices and mesoscopic helical filaments. The short-pitch helical structure in the smectic phases is confirmed by resonant X-ray measurements.},
doi = {10.1038/s41467-017-02626-6},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {1}
}

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Cited by: 16 works
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    Works referencing / citing this record:

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    Achiral bent-core salicylaldimine compounds exhibiting dark conglomerate and B 2 mesophases: effect of linkage groups and lateral substituents
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    journal, January 2018

    • Gong, Chunhua; Guo, Haiyang; Zeng, Xianghua
    • Dalton Transactions, Vol. 47, Issue 20
    • DOI: 10.1039/c8dt00600h

    An effective strategy for creating asymmetric MOFs for chirality induction: a chiral Zr-based MOF for enantioselective epoxidation
    journal, January 2019

    • Berijani, Kayhaneh; Morsali, Ali; Hupp, Joseph T.
    • Catalysis Science & Technology, Vol. 9, Issue 13
    • DOI: 10.1039/c9cy00565j

    Achiral bent-core salicylaldimine compounds exhibiting dark conglomerate and B 2 mesophases: effect of linkage groups and lateral substituents
    journal, December 2018


    Schiff base/ester liquid crystals with different lateral substituents: mesophase behaviour and DFT calculations
    journal, December 2018


    W-shaped mesogens and variations of their molecular structure
    journal, September 2018


    Symmetrical and asymmetrical liquid crystal dimers: synthesis, characterisation and mesomorphic behaviour
    journal, June 2019


    Liquid crystal dimers containing Cholesteryl and Triazole-containing mesogenic units
    journal, July 2019


    Structure-property relationships in azobenzene-based twist-bend nematogens
    journal, September 2019


    A series of fluorinated liquid crystals with an alanine residue
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