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Chirality02:25

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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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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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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 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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Chirality in Nature02:30

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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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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Inverted Chiral Response in Folded Anisotropic van der Waals Materials.

Sunwoong Yang1, Minwoo Lee2, Junkyoung Kim2

  • 1Division of Science Education, Kangwon National University, Chuncheon 24341, Republic of Korea.

The Journal of Physical Chemistry Letters
|June 30, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel folding method to create distinct vertical orientations in anisotropic van der Waals materials like rhenium disulfide. This technique enables chirality-dependent optical and electronic properties for optoelectronic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • In-plane anisotropic van der Waals (vdW) materials exhibit chirality-related properties tied to their vertical orientations.
  • Achieving controlled vertical orientations in these materials is a significant challenge.
  • This limits their potential in novel optoelectronic applications.

Purpose of the Study:

  • To introduce a facile one-step folding approach for creating structural differences in anisotropic vdW materials.
  • To demonstrate the feasibility of this method using rhenium disulfide (ReS2).
  • To explore the resulting chirality-dependent phenomena for optoelectronic applications.

Main Methods:

  • Electrochemical exfoliation of rhenium disulfide (ReS2).
  • One-step folding during the drop-casting process to induce structural differences.
  • Characterization using atomic force microscopy (AFM), Kelvin probe force microscopy (KPFM), polarized optical microscopy, angle-resolved photoluminescence, and Raman spectroscopy.

Main Results:

  • The folding method successfully created distinct vertical orientations in ReS2 flakes.
  • While structural and electronic properties remained similar, optical characterizations revealed significant chiral phenomena.
  • Opposite vertical orientations were confirmed in folded ReS2 regions.
  • Chirality-dependent Raman spectra and photocurrent were observed.

Conclusions:

  • The proposed folding technique offers a viable strategy for engineering vertical orientations in anisotropic vdW materials.
  • The observed chirality-dependent optical and electronic responses open avenues for chirality-related optoelectronic devices.
  • This work highlights the potential of manipulating vdW material structures for advanced functionalities.