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Related Concept Videos

Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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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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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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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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Toward Optical Detection of Single Chiral Molecules Using Magneto-Optical Hyperbolic Metasurfaces.

William O F Carvalho1, Ana L Lyra Pavanelli1, Osvaldo N Oliveira2

  • 1National Institute of Telecommunications (Inatel), Santa Rita Do Sapucaí, Minas Gerais 37536-001, Brazil.

ACS Applied Materials & Interfaces
|October 3, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel optical metasurface for detecting single chiral molecules, overcoming limitations of traditional circular dichroism spectroscopy. The technology offers highly sensitive, label-free chiral biosensing capabilities.

Keywords:
chiral Biosensingfew-molecule sensinghyperbolic metamaterialsmagnetic Circular Dichroismmagnetochiroptical Sensingmetasurfaces

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Area of Science:

  • Nanophotonics and Metamaterials
  • Chiroptical Spectroscopy
  • Biosensing

Background:

  • Traditional circular dichroism spectroscopy requires high concentrations and large sample volumes.
  • Developing sensitive methods for single chiral molecule detection is crucial for various scientific fields.

Purpose of the Study:

  • To propose and demonstrate an optical metasurface architecture for ultrasensitive chiral molecule detection.
  • To enable label-free detection of single chiral molecules using magnetic circular dichroism (MCD).

Main Methods:

  • Fabrication of nanodisks from magneto-optical hyperbolic metamaterials in two-dimensional gratings.
  • Coupling incident light into bulk plasmon-polariton modes via phase-matching conditions.
  • Utilizing polar magnetic field configuration to induce MCD signals for chiral sensing.

Main Results:

  • Demonstrated two complementary MCD-based sensing strategies: refractometric and chiroptical.
  • Achieved high MCD sensitivity (S = 245 nm·RIU⁻¹) for refractometric detection.
  • Enabled detection of single chiral molecules with significant MCD peak values at ultralow concentrations.

Conclusions:

  • The proposed optical metasurface platform enables label-free detection of single chiral molecules.
  • This technology significantly advances the sensitivity and efficiency of chiral molecule detection.
  • The platform holds promise for future applications in chiral biosensing.