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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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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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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
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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 most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Towards chiral acoustoplasmonics.

Beatriz Castillo López de Larrinzar1, Chushuang Xiang2, Edson Rafael Cardozo de Oliveira2

  • 1Instituto de Micro y Nanotecnología IMN-CNM, CSIC, CEI UAM + CSIC, Isaac Newton 8, Tres Cantos, Madrid 28760, Spain.

Nanophotonics (Berlin, Germany)
|May 22, 2023
PubMed
Summary
This summary is machine-generated.

Chiral nanostructures with crossed bars show distinct light-handedness responses for absorption and scattering. This chirality enables enhanced coherent phonon excitation and detection for acoustoplasmonic transducers.

Keywords:
chiralnanoacousticsnanophononicsplasmonics

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Area of Science:

  • Nanomaterials science
  • Plasmonics
  • Acoustics

Background:

  • Controlling electromagnetic properties of nanostructured materials is crucial.
  • Chiral nanostructures, responding differently to helical polarization, offer unique optical functionalities.

Purpose of the Study:

  • To present a simple chiral nanostructure for controlling light-matter interactions.
  • To explore the potential of this system for enhanced coherent phonon generation and detection.

Main Methods:

  • Theoretical proposal of a nanostructure based on crossed elongated bars.
  • Investigating light-handedness dependent absorption and scattering cross-sections.
  • Proposing a time-resolved Brillouin scattering experiment for coherent phonon dynamics.

Main Results:

  • Demonstrated a 200% difference in absorption or scattering based on light helicity.
  • Optimized acoustic phonon generation by maximizing absorption.
  • Enhanced phonon detection by engineering scattering properties at specific wavelengths and helicities.

Conclusions:

  • The proposed chiral system effectively utilizes chirality for optical control.
  • This work is a foundational step towards efficient acoustoplasmonic transducers.
  • Highlights the potential of chirality in designing advanced optomechanical devices.