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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.
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...
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...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Published on: November 7, 2017

Paramagnetic aluminium β-diketiminate.

Jani Moilanen1, Javier Borau-Garcia, Roland Roesler

  • 1Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland.

Chemical Communications (Cambridge, England)
|July 31, 2012
PubMed
Summary

Researchers created a neutral main group radical from a β-diketiminate ligand framework. This radical is stabilized by spiroconjugation, featuring an unpaired electron on a group 13 element, confirmed by EPR spectroscopy and computational chemistry.

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

Published on: October 10, 2014

Area of Science:

  • Organometallic Chemistry
  • Main Group Chemistry
  • Radical Chemistry

Background:

  • The β-diketiminate ligand framework is a versatile platform in coordination chemistry.
  • Stabilization of main group radicals is crucial for developing new reactive species.
  • Spiroconjugation offers a unique electronic pathway for stabilizing unpaired electrons.

Purpose of the Study:

  • To synthesize and characterize a neutral main group radical stabilized by the β-diketiminate framework.
  • To investigate the role of spiroconjugation in stabilizing the radical species.
  • To explore the electronic properties of the resulting paramagnetic complex.

Main Methods:

  • Synthesis of a novel β-diketiminate-based main group complex.
  • Reduction of the complex to generate a radical species.
  • Electron Paramagnetic Resonance (EPR) spectroscopy for radical characterization.
  • Computational chemistry (e.g., DFT) to elucidate electronic structure and bonding.

Main Results:

  • Successful synthesis of a neutral main group radical featuring the β-diketiminate ligand.
  • Demonstration of radical stabilization through spiroconjugation involving the group 13 element.
  • Characterization of the paramagnetic nature of the complex using EPR spectroscopy.
  • Computational analysis confirmed the delocalization of the unpaired electron over the metal center and ligand framework.

Conclusions:

  • The β-diketiminate framework can effectively stabilize neutral main group radicals.
  • Spiroconjugation plays a key role in the electronic stabilization of these radical species.
  • The synthesized paramagnetic complex represents a novel class of main group radicals with potential applications in catalysis and materials science.