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Related Concept Videos

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...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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.
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
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...

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

Published on: July 20, 2022

Dimensionality selection in a molecule-based magnet.

Paul A Goddard1, Jamie L Manson, John Singleton

  • 1University of Oxford, Department of Physics, Clarendon Laboratory, Oxford, United Kingdom.

Physical Review Letters
|March 10, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a chemical method to control magnetic interactions in materials. This technique switches magnetic systems from quasi-two-dimensional to quasi-one-dimensional, enabling tailored magnetic device design.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Magnetism

Background:

  • Designing bespoke magnetic materials requires precise control over their building blocks and interactions.
  • While molecular materials synthesis, including coordination polymers, has advanced, tuning magnetic interactions within these frameworks remains challenging.

Purpose of the Study:

  • To demonstrate a chemical method for dimensionality selection in magnetic materials.
  • To control magnetic exchange interactions along specific crystal directions.

Main Methods:

  • Utilizing a chemical approach to selectively inhibit magnetic exchange interactions.
  • Applying the method to an S=1/2 antiferromagnet.

Main Results:

  • Achieved dimensionality selection by preferentially inhibiting magnetic exchange along one crystal direction.
  • Successfully switched the system from quasi-two-dimensional to quasi-one-dimensional behavior.
  • Maintained the nearest-neighbor coupling strength during the dimensional transition.

Conclusions:

  • The demonstrated chemical method offers a pathway to tune magnetic dimensionality.
  • This control over magnetic interactions is crucial for designing advanced magnetic devices.