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Related Concept Videos

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...
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Overview of Valence Bond Theory
Bonding in Metals02:32

Bonding in Metals

Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Related Experiment Video

Updated: Jul 2, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
13:21

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Strong coupling approach to actinide metals.

C D Batista1, J E Gubernatis, T Durakiewicz

  • 1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

We developed a new electronic structure model for plutonium (Pu) metal, differing from other actinides. This model accurately predicts plutonium

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Area of Science:

  • Solid State Physics
  • Quantum Chemistry
  • Materials Science

Background:

  • Actinide electronic structures are complex due to strong electron correlations.
  • Previous models for actinides often differ significantly from each other.
  • Plutonium (Pu) exhibits unique electronic properties requiring specialized theoretical approaches.

Purpose of the Study:

  • To develop a strongly correlated electronic structure model for actinide metals.
  • To specifically derive a low-energy Hamiltonian for plutonium (Pu) metal.
  • To compare the Pu model with those of other actinides and lanthanides.

Main Methods:

  • Derivation of a low-energy effective Hamiltonian.
  • Assumption of small kinetic energy relative to Coulomb and spin-orbit interactions.
  • Calculation of photoemission spectrum and specific heat using the derived Hamiltonian.

Main Results:

  • A novel low-energy Hamiltonian (H[over]Pu) was derived for Pu metal.
  • The H[over]Pu model shows similarities to lanthanide models but differs from other actinide models.
  • Computed photoemission spectra and specific heat for alpha and delta-Pu show good agreement with experimental data.

Conclusions:

  • The derived strongly correlated approach provides an accurate description of plutonium's electronic structure.
  • The H[over]Pu model offers a pathway for understanding the unique behavior of plutonium.
  • This approach validates the model's predictive power for plutonium properties.