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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.
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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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...

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Related Experiment Video

Updated: Jun 2, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

A tetranuclear, macrocyclic 3d-4f complex showing single-molecule magnet behavior.

Humphrey L C Feltham1, Rodolphe Clérac, Annie K Powell

  • 1Department of Chemistry and MacDiarmid Institute, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand.

Inorganic Chemistry
|April 12, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a rare 3d-4f single-molecule magnet using a macrocyclic ligand. The material displays slow magnetization relaxation at low temperatures, a key property for molecular magnetism.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetism

Background:

  • Single-molecule magnets (SMMs) are crucial for developing next-generation data storage and quantum computing technologies.
  • The synthesis of SMMs typically involves lanthanide ions, but incorporating 3d transition metals with macrocyclic ligands remains challenging.
  • Macrocyclic ligands offer structural rigidity and control over the coordination environment, potentially enhancing magnetic properties.

Purpose of the Study:

  • To synthesize and characterize a novel 3d-4f heterometallic complex incorporating a macrocyclic ligand.
  • To investigate the magnetic properties of the synthesized complex, specifically focusing on its potential as a single-molecule magnet.
  • To explore the role of the macrocyclic ligand in mediating magnetic interactions and relaxation dynamics.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the molecular structure of the [Cu(II)(3)Tb(III)(L(Pr))(NO(3))(2)(MeOH)(H(2)O)(2)](NO(3))·3H(2)O complex.
  • Magnetic susceptibility measurements (DC and AC) were performed over a range of temperatures and frequencies.
  • Variable-temperature direct current (DC) magnetic susceptibility studies were conducted to probe magnetic ordering and interactions.
  • Alternating current (AC) magnetic susceptibility measurements were employed to investigate the dynamic magnetic behavior and relaxation processes.

Main Results:

  • A rare 3d-4f heterometallic complex, [Cu(II)(3)Tb(III)(L(Pr))(NO(3))(2)(MeOH)(H(2)O)(2)](NO(3))·3H(2)O, was successfully synthesized and structurally characterized.
  • The complex exhibits frequency-dependent alternating-current susceptibility at low temperatures.
  • This frequency dependence is indicative of slow relaxation of the magnetization, a hallmark of single-molecule magnet behavior.

Conclusions:

  • The synthesized 3d-4f complex represents a rare example of a single-molecule magnet prepared using a macrocyclic ligand.
  • The observed slow magnetic relaxation highlights the potential of macrocyclic ligands in designing advanced molecular magnetic materials.
  • This work contributes to the fundamental understanding of structure-property relationships in 3d-4f molecular magnets.