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Electric-Field-Induced Chirality in Columnar Liquid Crystals
Alberto Concellón1, Ru-Qiang Lu1, Kosuke Yoshinaga1
1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|June 11, 2021
Summary
Novel tetraphenylbenzene discotic molecules form J-aggregates and liquid crystal phases. An electric field induces helical organization in these chiral liquid crystals (LCs), enabling new chiral materials.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Organic Chemistry
Background:
- Discotic molecules self-assemble into ordered structures.
- Liquid crystals (LCs) exhibit unique phase behaviors.
- Chiral materials are crucial for advanced applications.
Purpose of the Study:
- To synthesize and characterize novel tetraphenylbenzene-based discotic molecules.
- To investigate their self-assembly and liquid crystalline properties.
- To explore electric-field-induced chiral organization.
Main Methods:
- Synthesis of tetraphenylbenzene-based discotic molecules.
- Absorption and fluorescence spectroscopy to study aggregation.
- Polarized optical microscopy and differential scanning calorimetry for LC phase analysis.
- Application of electric fields to induce structural changes.
Main Results:
- Formation of J-type aggregates in solution with enhanced emission.
- Observation of enantiotropic hexagonal columnar liquid crystal phases.
- Electric-field-induced transition to helical columnar organization.
- Chirality induction driven by molecular conformation and stereogenic centers.
Conclusions:
- Tetraphenylbenzene discotic molecules exhibit remarkable self-assembly and LC behavior.
- Electric fields can controllably induce helical chirality in columnar phases.
- These findings open avenues for developing next-generation chiral materials.
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