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Related Concept Videos

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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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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Circularly Polarized Luminescence Chirality Inversion and Dual Anticounterfeiting Labels Based on Fluorescent

Jialei He1, Mitsuo Hara1, Ryosuke Ohnuki2

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PubMed
Summary

Researchers developed fluorescent liquid crystal particles with tunable circularly polarized luminescence (CPL). Adjusting chiral dopant concentration reversed CPL direction, enabling novel anticounterfeiting applications.

Keywords:
anticounterfeitingchiral structural colorschirality inversioncholesteric liquid crystals particlescircularly polarized luminescence

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optoelectronics

Background:

  • Developing materials with circularly polarized luminescence (CPL) is a key challenge in materials science.
  • Controlling chiral properties of polymers and their CPL is an active research area.
  • Chirality inversion of CPL in fluorescent liquid crystal particles by chiral dopant concentration remains underexplored.

Purpose of the Study:

  • To prepare fluorescent cholesteric liquid crystal (FCLC) particles with tunable CPL properties.
  • To investigate the effect of chiral dopant concentration on CPL direction and structural color.
  • To develop a dual verification system for anticounterfeiting using FCLC particles.

Main Methods:

  • Synthesis of fluorescent cholesteric liquid crystal (FCLC) particles.
  • Characterization of structural color and CPL properties.
  • Analysis of the influence of chiral dopant concentration on chirality inversion.

Main Results:

  • Demonstrated tunable CPL and polarizable structural color in FCLC particles.
  • Showed that varying chiral dopant concentration reverses the CPL direction.
  • Confirmed the role of the twist grain boundary phase in ground-state chirality inversion and CPL chirality switching.

Conclusions:

  • Chiral dopant concentration critically controls CPL chirality in FCLC particles.
  • The twist grain boundary phase formation is essential for chirality inversion.
  • A dual verification system using FCLC particles offers advanced anticounterfeiting solutions.