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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

10.2K
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...
10.2K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

24.7K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.4K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.4K
Colors and Magnetism03:02

Colors and Magnetism

12.9K
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...
12.9K
Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

2.7K
Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from...
2.7K
Molecular Geometry and Dipole Moments02:36

Molecular Geometry and Dipole Moments

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The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
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Related Experiment Video

Updated: Nov 20, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Coordination-Cluster-Based Molecular Magnetic Refrigerants.

Shaowei Zhang1,2, Peng Cheng2,3

  • 1Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of the Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, P.R. China.

Chemical Record (New York, N.Y.)
|July 7, 2016
PubMed
Summary

Coordination clusters show promise as molecular magnetic refrigerants. This review details their synthesis, structure, and magnetocaloric properties for cryogenic applications.

Keywords:
cluster compoundslanthanidesmagnetic propertiesrefrigerantssynthesis design

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Area of Science:

  • Materials Science
  • Magnetism
  • Chemistry

Background:

  • Molecular magnetic refrigerants are gaining interest for cryogenic applications.
  • Coordination cluster compounds offer advantages for magnetic refrigeration.
  • Recent research focuses on these clusters for their magnetocaloric effect.

Purpose of the Study:

  • To review the synthesis, structure, and magnetothermal properties of coordination clusters used as magnetic refrigerants.
  • To classify these molecular magnetic refrigerants based on metal centers and structure.
  • To provide an overview of recent progress and a guide for new researchers in the field.

Main Methods:

  • Classification of molecular magnetic refrigerants into homo- and heterometallic clusters.
  • Categorization based on metal nuclearity and dimensionality (discrete or extended structures).
  • Analysis of magnetocaloric properties.

Main Results:

  • Coordination clusters are effective molecular magnetic refrigerants.
  • The study categorizes refrigerants by metal type (homo- and heterometallic) and structure.
  • Recent advancements in coordination-cluster-based refrigerants are highlighted.

Conclusions:

  • Coordination clusters are a significant area of research for molecular magnetic refrigerants.
  • Understanding their synthesis, structure, and magnetothermal properties is crucial.
  • This review serves as a foundational resource for the field.