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Related Concept Videos

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.
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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...
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...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...

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Related Experiment Video

Updated: May 29, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Twisted molecular magnets.

Ross Inglis1, Constantinos J Milios, Leigh F Jones

  • 1EaStChem School of Chemistry, The University of Edinburgh, The Kings Buildings, West Mains Road, Edinburgh, EH9 3JJ, UK.

Chemical Communications (Cambridge, England)
|September 6, 2011
PubMed
Summary
This summary is machine-generated.

Researchers synthesized manganese Single-Molecule Magnets (SMMs) with tunable magnetic properties. Structural distortions controlled magnetic exchange, enabling prediction of new SMM behaviors.

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Last Updated: May 29, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetism

Background:

  • Single-Molecule Magnets (SMMs) are crucial for developing advanced magnetic materials.
  • Manganese complexes offer a promising platform for SMM research.
  • Salicylaldoxime ligands facilitate the synthesis of polynuclear manganese clusters.

Purpose of the Study:

  • To synthesize and characterize novel hexanuclear and trinuclear manganese SMMs.
  • To investigate the impact of structural distortions on magnetic properties.
  • To establish a magneto-structural correlation for predicting SMM behavior.

Main Methods:

  • Synthesis of manganese complexes using derivatised salicylaldoximes.
  • Structural characterization through X-ray diffraction.
  • Magnetic property measurements (e.g., SQUID magnetometry).

Main Results:

  • Successfully synthesized approximately fifty hexanuclear ([Mn(III)(6)]) and thirty trinuclear ([Mn(III)(3)]) SMMs.
  • Achieved targeted structural distortions, leading to puckered configurations.
  • Observed a switch in magnetic exchange from antiferromagnetic to ferromagnetic interactions.
  • Established a semi-quantitative magneto-structural correlation.

Conclusions:

  • Structural modifications of manganese clusters directly influence magnetic properties.
  • The developed magneto-structural correlation aids in predicting SMM behavior.
  • This work provides a foundation for designing novel SMMs with tailored functionalities.