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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...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
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.
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...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...

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Related Experiment Video

Updated: Jul 11, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Structures with tunable strong ferromagnetic coupling: from unordered (1D) to ordered (Discrete).

Yong-Fei Zeng1, Jiong-Peng Zhao, Bo-Wen Hu

  • 1Department of Chemistry, Nankai University, Tianjin, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 14, 2007
PubMed
Summary
This summary is machine-generated.

Two copper complexes with azido and carboxylate ligands show strong ferromagnetic coupling. Unlike the 1D system, the discrete trinuclear complex exhibits long-range magnetic ordering, explained by DFT calculations.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Investigating the magnetic properties of coordination complexes is crucial for developing novel magnetic materials.
  • Azido and carboxylate ligands are known to mediate magnetic exchange interactions in metal-ion complexes.
  • Understanding structure-property relationships in copper(II) complexes can lead to tailored magnetic behaviors.

Purpose of the Study:

  • To synthesize and characterize 1D and trinuclear azido copper(II) carboxylate complexes.
  • To investigate the magnetic properties, specifically ferromagnetic coupling and ordering, of these complexes.
  • To rationalize the observed magnetic behavior using theoretical calculations.

Main Methods:

  • X-ray crystallography for structural determination.
  • Magnetic susceptibility measurements from 2 to 300 K.
  • Density functional (DFT) calculations for theoretical analysis of magnetism.

Main Results:

  • Both 1D ([Cu(1.5)(hnta)(N(3))(2)(H(2)O)](n)) and trinuclear ([Cu(3)(hnta)(4)(N(3))(2)(H(2)O)(3)]) complexes exhibit strong ferromagnetic coupling.
  • The discrete trinuclear complex shows long-range ferromagnetic ordering, while the 1D system does not.
  • DFT calculations accurately predicted coupling constants (J values) and explained the ferromagnetic coupling mechanism.

Conclusions:

  • Structural differences between the 1D and trinuclear complexes significantly influence their magnetic ordering.
  • The study provides insights into the design principles for achieving long-range magnetic order in molecular materials.
  • Theoretical calculations are valuable tools for understanding and predicting magnetic exchange interactions in coordination complexes.