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Related Concept Videos

Chirality02:25

Chirality

29.5K
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.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Chirality in Nature02:30

Chirality in Nature

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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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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.2K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

7.0K
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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Updated: Feb 2, 2026

A Micropatterning Assay for Measuring Cell Chirality
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A Micropatterning Assay for Measuring Cell Chirality

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Spin-Selective Transmission and Devisable Chirality in Two-Layer Metasurfaces.

Zhancheng Li1, Wenwei Liu1, Hua Cheng1

  • 1The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and TEDA Institute of Applied Physics, Nankai University, Tianjin, 300071, China.

Scientific Reports
|August 17, 2017
PubMed
Summary
This summary is machine-generated.

Researchers engineered metasurfaces with twisted nanorods to create strong, tunable chirality. This breakthrough enables highly sensitive detection and manipulation of chiral molecules for advanced spin optics and sensing applications.

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Area of Science:

  • Nanophotonics
  • Metasurface Engineering
  • Chirality Studies

Background:

  • Chirality, a fundamental property of matter, is widespread in nature but often difficult to detect due to its subtle presence.
  • Metasurfaces offer novel platforms for manipulating light-matter interactions at the nanoscale, presenting opportunities for enhanced chiral detection.

Purpose of the Study:

  • To demonstrate engineered chirality in two-layer metasurfaces composed of twisted nanorods.
  • To explore the potential of these metasurfaces for highly sensitive chiral sensing and spin-selective applications in the near-infrared region.

Main Methods:

  • Fabrication of two-layer metasurfaces using twisted nanorods.
  • Characterization of spin-selective transmission properties.
  • Investigation of chirality tunability by altering the orientation angle between nanorods.

Main Results:

  • Achieved giant spin-selective transmission in the near-infrared region.
  • Demonstrated tunable engineered chirality by adjusting the nanorod orientation angle.
  • Proposed two metasurfaces with opposite spin-selective transmission behavior, acting as enantiomers.

Conclusions:

  • The developed metasurfaces provide a simple and effective method for engineering chirality.
  • These findings open new avenues for applications in spin optics, enantiomeric discrimination, and enhanced chiral sensing.