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Azobenzene/Triptycene-Based Cholesteric Liquid Crystal Dopants.

Brandon Balamut1, Kai Hanke2,3, Ivan Aprahamian1

  • 1Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, NH, 03755, USA.

Angewandte Chemie (International Ed. in English)
|November 10, 2025
PubMed
Summary
This summary is machine-generated.

Switchable chiral dopants in cholesteric liquid crystals (CLCs) enable phototuning of structural color. Triptycene-azobenzene dopants exhibit high helical twisting power, leading to multicolor LC films.

Keywords:
AzobenzeneLiquid crystalsPhotoswitchingStructural colorTriptycene

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Physical Chemistry

Background:

  • Cholesteric liquid crystals (CLCs) exhibit structural color tunable by chiral dopants.
  • The precise interactions between CLCs and dopants, and chiral information transfer, remain incompletely understood.

Purpose of the Study:

  • To investigate the structure-property relationships of photoswitchable chiral dopants for CLCs.
  • To elucidate the mechanisms of chiral information transfer from dopants to CLCs.

Main Methods:

  • Synthesized and characterized five chiral dopants featuring a triptycene core and azobenzene switchable unit.
  • Performed structure-property analysis to correlate dopant structure with helical twisting power (β).
  • Investigated the impact of E/Z photoisomerization of azobenzene on β values.

Main Results:

  • Triptycene-azobenzene dopants demonstrated high helical twisting power (β) values up to 127 µm⁻¹.
  • Dispersion interactions and electron-deficient aromatic units were identified as key factors influencing β.
  • Significant changes in β upon E/Z photoswitching were observed.

Conclusions:

  • The triptycene-azobenzene system effectively transfers chiral information to CLCs.
  • Photoswitchable dopants enable the development of multicolor, high-contrast liquid crystal films.
  • Understanding these interactions allows for precise control over optical properties across UV to IR ranges.