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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

10.9K
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...
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Colors and Magnetism03:02

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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...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.2K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
1.2K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.1K
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...
30.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.6K
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,...
47.6K
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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

1.6K
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.
1.6K

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Updated: Dec 28, 2025

Magnetic Tweezers for the Measurement of Twist and Torque
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Trigonal bipyramidal CoDy3 cluster exhibiting single-molecule magnet behavior.

Hui-Jie Lun1, Xiang-Jian Kong1, La-Sheng Long1

  • 1Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China. xjkong@xmu.edu.cn lslong@xmu.edu.cn.

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|February 11, 2020
PubMed
Summary
This summary is machine-generated.

A novel heterometallic compound containing cobalt, dysprosium, and sodium was synthesized. This molecule exhibits single-molecule magnet behavior, showing potential for advanced magnetic applications.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Heterometallic compounds integrating 3d and 4f metal ions are crucial for developing advanced magnetic materials.
  • Understanding the structure-property relationship in these complexes is key to designing novel molecular magnets.

Purpose of the Study:

  • To synthesize and characterize a new heterometallic 3d-4f compound.
  • To investigate the magnetic properties of the synthesized compound, specifically its potential as a single-molecule magnet.

Main Methods:

  • Synthesis of the heterometallic compound {[CoIII2Dy3Na(CH3CH2COO)6(OH)6(NO3)4(H2O)2]·H2O}n (1).
  • Structural characterization using X-ray diffraction to determine the metal core geometry.
  • Magnetic susceptibility measurements to evaluate magnetic behavior, including single-molecule magnet properties.

Main Results:

  • Successful synthesis and structural elucidation of compound 1, featuring a Co2Dy3 metal core with trigonal bipyramidal geometry.
  • Compound 1 exhibits single-molecule magnet behavior.
  • An energy barrier of 60.3 K was determined for the magnetic relaxation under a zero dc field.

Conclusions:

  • The synthesized heterometallic compound demonstrates promising single-molecule magnet characteristics.
  • The trigonal bipyramidal Co2Dy3 core is responsible for the observed magnetic behavior.
  • This study contributes to the field of molecular magnetism with a new potential candidate for magnetic memory devices.