Structure-property relationships in azobenzene-based twist-bend nematogens

Jordan P. Abberley, John M.D. Storey, Corrie T. Imrie*

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The synthesis and characterisation of a new set of azobenzene-based non-symmetric liquid crystal dimers, the 1-(4-substitutedazobenzene-4ʹ-yloxy)-6-(4-methoxybiphenyl-4ʹ-yl)hexanes (MeOB6OABX), that exhibit the twist-bend nematic phase, NTB, is described. The terminal substituents are methyl, methoxy, ethyl, butyl, butoxy, and nitrile. All six dimers exhibit both the NTB and conventional nematic, N, phases. The identification of the NTB phase was performed using polarised light microscopy and confirmed for binary mixtures with a standard twist-bend nematogen 1,7-bis-4-(4ʹ-cyanobiphenyl) heptane (CB7CB). The transitional behaviour of the MeOB6OABX dimers is compared with that of the corresponding ether-linked 1-(4-substitutedazobenzene-4ʹ-yloxy)-6-(4-methoxybiphenyl-4ʹ-yloxy)pentanes, MeOBO5OABX, all of which exhibit a conventional nematic phase. In addition, the nitrile-substituted MeOBO5OABCN shows the NTB phase. The behaviour of these non-symmetric dimers is also compared to that of the corresponding symmetric dimers. Differences in the transitional properties between these sets of new materials are accounted for in terms of not only molecular shape but also other factors including the strength of the mixed mesogen interaction.

Original languageEnglish
Pages (from-to)2102-2114
Number of pages13
JournalLiquid Crystals
Volume46
Issue number13-14
Early online date6 Sep 2019
DOIs
Publication statusPublished - 2019

Keywords

  • azobenzene
  • liquid crystal dimers
  • non-symmetric dimers
  • Twist-bend nematic phase
  • MESOMORPHIC BEHAVIOR
  • COPOLYMERS
  • INDUCTION
  • OLIGOMERS
  • DEPENDENCE
  • NEMATIC PHASE
  • TRANSITIONAL PROPERTIES
  • LIQUID-CRYSTAL DIMERS
  • MESOGENIC LINKING UNIT
  • SYMMETRY-BREAKING

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