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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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

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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,...
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Valence Bond Theory02:42

Valence Bond Theory

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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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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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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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Molecular Models02:00

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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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.
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Updated: Mar 9, 2026

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Metal Ion Modeling Using Classical Mechanics.

Pengfei Li1, Kenneth M Merz1

  • 1Department of Chemistry, Department of Biochemistry and Molecular Biology, and Institute of Cyber-Enabled Research, Michigan State University , East  Lansing, Michigan 48824, United States.

Chemical Reviews
|January 4, 2017
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Summary
This summary is machine-generated.

This review covers computational methods for modeling metal ions across various phases. It highlights classical and quantum approaches, informing future enhancements in metal ion system simulations.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Biochemistry

Background:

  • Metal ions are crucial in chemistry, geochemistry, biochemistry, and materials science.
  • Computational methods are vital for modeling metal ions in gas, aqueous, and solid phases.

Purpose of the Study:

  • To review classical and quantum modeling strategies for metal ion systems.
  • To focus on classical metal ion modeling techniques and their quantum mechanical underpinnings.

Main Methods:

  • Review of unpolarized and polarizable classical models (nonbonded, bonded, fluctuating charge, Drude oscillator, induced dipole).
  • Discussion of angular overlap model and valence bond-based models.
  • Overview of quantum mechanical methods (semiempirical, ab initio, density functional theory).

Main Results:

  • Classical modeling strategies for metal ions encompass diverse approaches.
  • Quantum mechanical methods provide insights that enhance classical modeling.
  • A comprehensive overview of established and emerging metal ion modeling techniques is presented.

Conclusions:

  • Classical modeling of metal ions is a rapidly evolving field.
  • Integration of quantum and classical methods offers significant potential.
  • Future research should focus on further refining classical metal ion modeling techniques.