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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Stereoisomerism02:52

Stereoisomerism

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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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Published on: July 3, 2015

Enantiopurity-Controlled Magnetism in a Two-Dimensional Organic-Inorganic Material.

P Garrett Hegel1, Oscar Gonzalez1,2, Mingrui Li1

  • 1Department of Chemistry, University of California, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|July 1, 2026
PubMed
Summary

Chiral organic molecules in 2D intercalation compounds tune magnetism via enantiomeric excess (ee), not just absolute chirality. Low-ee materials exhibit unique dynamic magnetism, offering new design principles for hybrid electronic materials.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Magnetism

Background:

  • Chiral solids with unpaired electron spin offer potential for advanced electronic technologies.
  • Hybrid organic-inorganic materials are typically studied based on absolute chirality.
  • Enantiomeric excess (ee) has been underexplored as a tuning parameter in these materials.

Purpose of the Study:

  • To investigate the role of enantiomeric excess (ee) in tuning the magnetic properties of 2D intercalation compounds.
  • To explore the potential of controlling magnetism through varying ee in chiral molecule-inorganic crystal hybrids.
  • To establish design principles for 2D chiral and magnetically dynamic materials.

Main Methods:

  • Synthesis of 2D intercalation compounds via cation exchange of MnPS3 with chiral organic molecules.
  • Controlled variation of enantiomeric excess (ee) in the intercalated chiral molecules.
  • Magnetic characterization to correlate magnetic behavior with ee and absolute chirality.

Main Results:

  • Magnetism in the 2D compounds is dictated by the enantiomeric excess (ee) of the intercalant, not its absolute chirality.
  • Materials with low ee exhibit thermally activated dynamic magnetism, unlike enantiopure analogs.
  • ee-dependent magnetic behaviors are linked to local ordering of Mn vacancies influenced by electrostatics and molecular packing.

Conclusions:

  • Enantiomeric excess (ee) is a critical and tunable parameter for controlling magnetism in chiral molecule-material hybrids.
  • Low-ee materials demonstrate unique dynamic magnetic properties, expanding the scope of chiral magnetism.
  • This work provides a new strategy for designing 2D chiral materials with tailored magnetic and dynamic behaviors.