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Article
Hybrid Rod-Like and Bent-Core Liquid Crystal Dimers Exhibiting Biaxial Smectic a and Nematic Phases
Journal of Materials Chemistry (2012)
  • Yan Wang, Kent State University - Kent Campus
  • Hyung Guen Yoon, Kent State University - Kent Campus
  • Hari Krishna Bisoyi, Kent State University - Kent Campus
  • Satyendra Kumar, Kent State University - Kent Campus
  • Quan Li, Kent State University - Kent Campus
Abstract
Liquid crystal hybrid dimers involving bent-core units and rod-like units were designed, synthesized and investigated by a combination of polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction studies. All the four unsymmetrical dimers 1–4 exhibited stable nematic phases over a wide temperature range. Moreover, dimer 1exhibited the biaxial smectic A (SmA) phase and dimer 2 exhibited a highly ordered mesophase below the nematic (N) phase. Two rod-like and bent-core nematogenic units were covalently linked in dimers 3 and 4 to furnish exclusively the nematic phase. The observation of the biaxial SmA phase underlying the nematic phase in one of the bent-core–rod dimers 1 would be a significant step forward towards achieving the biaxial nematic phase and resolving controversies related to the presence of cybotactic groups.
Keywords
  • Dielectric Inversion Frequency,
  • Banana Calamitic Dimers,
  • Mesophase Behavior,
  • Homologous Series,
  • Molecular Design,
  • Polar Order,
  • Mesogens,
  • Transition,
  • Field,
  • Unit
Disciplines
Publication Date
2012
Publisher Statement
Available on publisher's site at http://dx.doi.org/10.1039/c2jm34315k.
Citation Information
Yan Wang, Hyung Guen Yoon, Hari Krishna Bisoyi, Satyendra Kumar, et al.. "Hybrid Rod-Like and Bent-Core Liquid Crystal Dimers Exhibiting Biaxial Smectic a and Nematic Phases" Journal of Materials Chemistry Vol. 22 Iss. 38 (2012)
Available at: http://works.bepress.com/satyendra_kumar/60/