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Colors and Magnetism

Colors and Magnetism

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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.

Ferromagnetism

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...

Valence Bond Theory

Valence Bond Theory

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Diamagnetism

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Structural Isomerism

Structural Isomerism

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Related Experiment Video

Updated: Jun 12, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Isostructural single-chain and single-molecule magnets.

Patrick L Feng¹, Casey J Stephenson, David N Hendrickson

¹Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358, USA.

Inorganic Chemistry

|June 23, 2010

Summary

Synthesized isostructural single-chain magnets (SCM) and single-molecule magnets (SMM) exhibit distinct magnetic behaviors. Differences in magnetization reversal barriers highlight the complex spin dynamics in these related materials.

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers

Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers

Published on: July 25, 2012

Area of Science:

Coordination Chemistry
Magnetochemistry
Materials Science

Background:

Single-chain magnets (SCM) and single-molecule magnets (SMM) are molecular materials exhibiting slow magnetic relaxation.
Isostructural compounds offer a unique platform to study structure-property relationships in magnetism.

Purpose of the Study:

To synthesize and characterize isostructural SCM and SMM systems.
To investigate the influence of structural similarity on magnetic properties, specifically magnetization reversal barriers.

Main Methods:

Chemical synthesis of manganese-based complexes.
Magnetic characterization including magnetization measurements.
Analysis of magnetic anisotropy and spin dynamics.

Main Results:

Two isostructural complexes, [Mn(6)X(2)(salox)(6)O(2)(N(3))(8)] (X = Mn(II) (1), Cd(II) (2)), were synthesized.
Complex 1 (SCM) showed a higher effective magnetization reversal barrier (U(eff) = 100.3 K) than Complex 2 (SMM) (U(eff) = 57.0 K).
Comparable uniaxial anisotropies (D) and ground state spin values (S) were observed despite differing U(eff).

Conclusions:

The synthesized isostructural SCM and SMM systems display significantly different magnetic behaviors.
The observed differences in magnetization reversal barriers underscore the role of intrinsic spin dynamics in structurally related materials.
These findings contribute to understanding the fundamental principles governing magnetic properties in molecular magnets.