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Related Concept Videos

Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Light-driven reversible handedness inversion in self-organized helical superstructures.

Manoj Mathews1, Rafael S Zola, Shawn Hurley

  • 1Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242, USA.

Journal of the American Chemical Society
|December 4, 2010
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Researchers achieved reversible color tuning in liquid crystals by using light-responsive chiral dopants. This fast-photon-mode switching enables tunable reflection colors from blue to near-infrared, with potential for novel optical materials.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photonics

Background:

  • Cholesteric liquid crystals exhibit self-organized helical superstructures.
  • Chiral dopants induce and control helical structures in liquid crystals.
  • Photoisomerizable molecules offer light-tunable properties.

Purpose of the Study:

  • To develop a fast-photon-mode method for reversible handedness inversion in cholesteric liquid crystals.
  • To utilize photoisomerizable chiral cyclic azobenzenophanes as dopants for tunable optical properties.
  • To investigate the induction of opposite helical handedness using different dopant switching states.

Main Methods:

  • Synthesis and characterization of two chiral cyclic azobenzenophanes.
  • Incorporation of dopants into achiral liquid crystal hosts.
  • Photoisomerization (trans-cis) induced by light irradiation.
  • Direct determination of helical handedness using a novel method.

Main Results:

  • The chiral dopants demonstrated reversible trans-cis isomerization without racemization.
  • High helical twisting power and significant photoisomerization-induced changes were observed.
  • Reversible tuning of reflection colors from blue to near-infrared was achieved.
  • Opposite helical handedness was induced by different switching states of the dopants.

Conclusions:

  • Photoisomerizable chiral cyclic dopants enable fast, reversible handedness inversion in cholesteric liquid crystals.
  • Light-induced color tuning across a broad spectrum (blue to near-IR) is feasible.
  • The developed method allows unambiguous determination of helical handedness in long-pitched cholesteric phases.