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Related Concept Videos

Metal-Ligand Bonds02:51

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...
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
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...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Ligand design for functional metal-organic frameworks.

Filipe A Almeida Paz1, Jacek Klinowski, Sérgio M F Vilela

  • 1Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. filipe.paz@ua.pt

Chemical Society Reviews
|September 16, 2011
PubMed
Summary

Metal-organic frameworks (MOFs) properties are dictated by their organic linker structure. This review highlights advances in designing MOFs for applications like gas storage, catalysis, and sensing.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs), or coordination polymers, self-assemble from metallic centers and organic linkers.
  • MOFs offer tunable properties making them promising for diverse applications.

Purpose of the Study:

  • To review key advances in MOF research.
  • To elucidate the structure-property relationships of MOFs based on organic linker design.
  • To highlight MOFs for specific applications.

Main Methods:

  • Critical review of existing literature on MOF synthesis and characterization.
  • Analysis of structure-property correlations in functional MOFs.
  • Focus on MOFs designed for gas storage, CO2 sequestration, catalysis, and luminescence.

Main Results:

  • The physical and chemical properties of organic linkers decisively influence MOF functionality.
  • Specific linker designs enable targeted MOF properties for various applications.
  • MOFs show potential in hydrogen/methane storage, CO2 capture, catalysis, and sensing.

Conclusions:

  • Organic linker design is paramount for developing advanced functional MOFs.
  • MOFs are versatile materials with significant potential across multiple scientific and industrial fields.
  • Further research into linker-based MOF design will drive innovation.