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Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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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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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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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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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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The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system...
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Quantum interference directed chiral raman scattering in two-dimensional enantiomers.

Shishu Zhang1, Jianqi Huang2,3, Yue Yu1

  • 1Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.

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|March 11, 2022
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Summary

Quantum interference in Raman scattering causes chiral responses in monolayer transitional metal dichalcogenides. This study reveals large circular intensity differences in rhenium dichalcogenide due to inter-k interference, opening new avenues for chiral optical materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Raman scattering spectroscopy is crucial for characterizing material structures and probing electron-photon/phonon interactions.
  • Quantum mechanics describes Raman scattering via electron excitation, phonon coupling, and photon emission, involving complex interference pathways.

Purpose of the Study:

  • To investigate quantum interference effects in Raman scattering.
  • To explore the induction of chiral Raman response in materials.

Main Methods:

  • Utilized Raman scattering spectroscopy.
  • Employed circularly polarized light with opposite helicities.
  • Investigated monolayer transitional metal dichalcogenides with triclinic symmetry, specifically rhenium dichalcogenide.

Main Results:

  • Observed significant chiral Raman response in monolayer transitional metal dichalcogenide with triclinic symmetry.
  • Demonstrated large circular intensity differences in monolayer rhenium dichalcogenide.
  • Attributed the chiral response to inter-k interference of Raman scattering.

Conclusions:

  • Quantum interference is a key mechanism leading to chiral Raman spectra.
  • Chiral Raman spectra represent a novel manifestation of quantum interference.
  • Findings may guide the development of other materials with induced chiral optical responses.