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Sulfur-linked cyanobiphenyl-based liquid crystal dimers and the twist-bend nematic phase

Journal Article · · Liquid Crystals
 [1];  [2];  [3];  [1];  [1];  [4];  [4];  [4];  [3];  [1]
  1. Univ of Aberdeen, Scotland (United Kingdom). Dept. of Chemistry, School of Natural and Computing Sciences
  2. Univ. of Warsaw (Poland). Faculty of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Univ. of Warsaw (Poland). Faculty of Chemistry
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
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The synthesis and characterisation of two series of cyanobiphenyl-based liquid crystal dimers containing sulfur links between the spacer and mesogenic units, the 4'-[1,ω-alkanediylbis(thio)]bis-[1,1'-biphenyl]-4-carbonitriles (CBSnSCB), and 4'-({ω-[(4'-cyano[1,1'-biphenyl]-4-yl)oxy]alkyl}thio)[1,1'-biphenyl]-4-carbonitriles (CBSnOCB) are described. The odd members of both series show twist-bend nematic and nematic phases, whereas the even members exhibit only the nematic phase. An analogous cyanoterphenyl-based dimer, 34-{6-[(4'-cyano[1,1'-biphenyl]-4-yl)thio]-hexyl}[11,21:24,31-terphenyl]-14-carbonitrile (CT6SCB), is also reported and shows enantiotropic NTB and N phases. The transitional properties of these dimers are discussed in terms of molecular curvature, flexibility and biaxiality. The same molecular factors also influence the birefringence of nematic phases. Resonant X-ray scattering studies of the twist-bend nematic phase at both the carbon and sulfur absorption edges were performed, which allowed for the determination of critical behaviour of the helical pitch at the transition to the nematic phase, the behaviour was found to be independent of molecular structure. It was also observed that despite the different molecular bending angle and flexibility, in all compounds the helical pitch length far from the N-NTB transition corresponds to 4 longitudinal molecular distances.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1561902
Journal Information:
Liquid Crystals, Journal Name: Liquid Crystals Journal Issue: 10 Vol. 46; ISSN 0267-8292
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

The interplay between spatial and heliconical bond order in twist-bend nematic materials preprint January 2020
Molecular Flexibility and Bend in Semi‐Rigid Liquid Crystals: Implications for the Heliconical Nematic Ground State journal October 2019
Investigation on thermal behaviour and optical properties of non-symmetric cholesterol-based twin liquid crystals with thioester linkages journal January 2020
Twist-Bend Nematogenic Supramolecular Dimers and Trimers Formed by Hydrogen Bonding journal March 2020
Investigation on thermal behaviour and optical properties of non-symmetric cholesterol-based twin liquid crystals with thioester linkages text January 2020
Investigation on thermal behaviour and optical properties of non-symmetric cholesterol-based twin liquid crystals with thioester linkages text January 2020

Figures / Tables (14)

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY