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Columnar Liquid Crystals from a Giant Macrocycle Mesogen.

Shin-Ichiro Kawano1, Masahiro Kato1, Shinya Soumiya1

  • 1Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan.

Angewandte Chemie (International Ed. in English)
|November 14, 2017
PubMed
Summary

Researchers created a giant macrocycle liquid crystal with a large square cavity. This novel material exhibits a rectangular columnar liquid crystal phase, offering potential for advanced applications.

Keywords:
diindolocarbazoleliquid crystalsmacrocyclesnanospacessupramolecular chemistry

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Columnar liquid crystals (LCs) are essential for advanced materials.
  • Macrocyclic mesogens offer unique structural possibilities for LCs.
  • Designing LCs with large internal cavities remains a challenge.

Purpose of the Study:

  • To synthesize and characterize a giant macrocyclic mesogen.
  • To investigate the liquid crystalline properties of the synthesized macrocycle.
  • To confirm the size and shape of the macrocycle's internal cavity.

Main Methods:

  • Synthesis of a giant macrocycle incorporating diindolocarbazole and salphen moieties.
  • Scanning tunneling microscopy (STM) for direct visualization of the macrocycle.
  • Single crystal analysis for structural confirmation.
  • Differential scanning calorimetry (DSC) and polarized optical microscopy (POM) for LC phase characterization.

Main Results:

  • Successful preparation of a giant macrocycle with a square internal cavity (2.5 nm diagonal).
  • STM imaging confirmed the macrocycle's structure and dimensions.
  • The synthesized macrocycle exhibited a stable rectangular columnar liquid crystal phase over a broad temperature range.
  • The macrocycle possesses the largest discrete inner space among known thermotropic columnar liquid crystals derived from macrocyclic mesogens.

Conclusions:

  • A novel giant macrocycle with a large internal cavity was successfully synthesized.
  • The material demonstrates promising liquid crystalline properties, specifically a rectangular columnar phase.
  • This work expands the scope of macrocyclic liquid crystals and their potential applications.