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

Cruickshank, Ewan; Salamończyk, Mirosław; Pociecha, Damian; Strachan, Grant J.; Storey, John M.  D.; Wang, Cheng; Feng, Jun; Zhu, Chenhui; Gorecka, Ewa; Imrie, Corrie T.

doi:10.1080/02678292.2019.1641638

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

Journal Article · 12 June 2019 · Liquid Crystals

DOI: https://doi.org/10.1080/02678292.2019.1641638 · OSTI ID:1561902

Cruickshank, Ewan ^[1]; Salamończyk, Mirosław ^[2];

^[3];

^[1]; Storey, John M. D. ^[1]; Wang, Cheng ^[4]; Feng, Jun ^[4]; Zhu, Chenhui ^[4]; Gorecka, Ewa ^[3];

^[1]

Univ of Aberdeen, Scotland (United Kingdom). Dept. of Chemistry, School of Natural and Computing Sciences
Univ. of Warsaw (Poland). Faculty of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of Warsaw (Poland). Faculty of Chemistry
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

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 N_TB 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-N_TB transition corresponds to 4 longitudinal molecular distances.

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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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