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Related Concept Videos

Chirality02:25

Chirality

23.0K
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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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 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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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Prochirality02:05

Prochirality

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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...
3.8K
Stereoisomerism02:52

Stereoisomerism

11.7K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Updated: May 29, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Chiral Molecular Magnet Superstructures with Light Control.

Zhongxuan Wang1, Ti Xie2, Zhenyao Fang3

  • 1Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742. United States.

Nano Letters
|February 3, 2025
PubMed
Summary
This summary is machine-generated.

Chiral magnets with tunable spin properties were created using molecular self-assembly. These structures exhibit a significant Faraday effect, paving the way for advanced spin-optoelectronic devices.

Keywords:
Chiral magnetsMagneto-optical couplingSelf-assembly of chiral superstructuresSpin manipulation

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Chiral magnets are essential for magneto-optical coupling in spin-optoelectronics.
  • Controlling the interplay between chirality and magnetism is a key challenge.

Purpose of the Study:

  • To engineer chiral helical magnetic superstructures with tunable spin properties.
  • To investigate the magneto-optical response, specifically the Faraday effect, controlled by circularly polarized light.

Main Methods:

  • Supramolecular assembly of chiral molecules to form magnetic superstructures.
  • Circular dichroism and electron microscopy to characterize structural transitions (vortex to helical nanowires).
  • Ferromagnetic resonance and magnetic anisotropy measurements under circularly polarized light control.

Main Results:

  • Demonstrated superstructure transition from vortex to helical nanowires.
  • Achieved circularly polarized light-controlled ferromagnetic magnetic resonance and anisotropy.
  • Observed a Faraday effect enhancement comparable to a 3 kOe magnetic field.

Conclusions:

  • Chiral helical magnetic superstructures offer tunable spin properties and significant Faraday effects.
  • This approach enables low-power magneto-optical devices and noncontact optical magnetics.
  • The findings advance the integration of chirality and magnetism for novel spintronic applications.