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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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.
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...
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Properties of Organometallic Compounds01:23

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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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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Colors and Magnetism

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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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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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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.
CFT focuses on...
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Coordination change, lability and hemilability in metal-organic frameworks.

Russell E Morris1, Lee Brammer

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Metal-organic frameworks (MOFs) exhibit dynamic behavior driven by changes in metal-ligand bonding. Understanding metal lability and coordination is key to MOF stability, reactivity, and novel properties.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are advanced porous materials with diverse applications.
  • Their functionality is intrinsically linked to their chemical composition, structural topology, and pore dimensions.

Purpose of the Study:

  • This review focuses on the chemistry of MOFs, specifically exploring how metal-ligand bonding influences their stability, reactivity, and dynamic behavior.
  • To connect metal lability and coordination changes to MOF properties and applications.

Main Methods:

  • The review synthesizes existing research on MOF chemistry, focusing on metal-ligand interactions.
  • Illustrative examples are provided to demonstrate flexible behavior, coordination changes, and their impact on framework properties.

Main Results:

  • Changes in metal-ligand bonding lead to flexible framework behavior, formation of open metal sites, and alterations in topology and dimensionality.
  • These chemical modifications result in new properties, including altered magnetic behavior, enhanced gas adsorption, and the creation of composite and amorphous MOFs.
  • Metal lability impacts MOF synthesis, stability, and can lead to defects via metal/linker exchange.

Conclusions:

  • Metal-ligand bonding dynamics are central to MOF functionality, enabling tunable properties and new material designs.
  • Understanding metal lability is crucial for controlling MOF synthesis, defect engineering, and developing advanced applications like selective adsorption.