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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.
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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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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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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: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.7K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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...
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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
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Modulating H2 sorption in metal-organic frameworks via ordered functional groups.

Phuong V Dau1, Seth M Cohen

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla 92093, USA. scohen@ucsd.edu.

Chemical Communications (Cambridge, England)
|September 2, 2014
PubMed
Summary
This summary is machine-generated.

Presynthetic and postsynthetic modification (PSM) strategies were used to control functional group organization in isoreticular metal-organic frameworks (IRMOFs). Ordered aryl groups in IRMOF pores led to hysteretic H2 sorption, unlike disordered groups which showed typical reversible sorption.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are porous crystalline materials with tunable structures.
  • Isoreticular metal-organic frameworks (IRMOFs) allow for systematic framework modification while maintaining the same topology.
  • Controlling the arrangement of functional groups within MOF pores is crucial for tailoring their properties.

Purpose of the Study:

  • To investigate the impact of structural organization of functional groups on hydrogen sorption in IRMOFs.
  • To explore the application of presynthetic and postsynthetic modification (PSM) for precise control over functional group placement.
  • To differentiate the H2 sorption behavior based on the ordered versus disordered introduction of aryl groups.

Main Methods:

  • Synthesis of IRMOFs with varying degrees of structural ordering of aryl groups.
  • Application of presynthetic modification (PSM) strategies to introduce functional groups before framework assembly.
  • Application of postsynthetic modification (PSM) strategies to introduce functional groups after framework assembly.
  • Characterization of the synthesized MOFs using techniques such as X-ray diffraction and gas sorption analysis.

Main Results:

  • Presynthetic and postsynthetic modification (PSM) effectively regulated the structural organization of aryl groups within IRMOF pores.
  • Ordered arrangement of aryl groups resulted in hysteretic H2 sorption behavior.
  • Disordered introduction of the same aryl groups led to reversible H2 sorption, characteristic of unmodified IRMOFs.

Conclusions:

  • The structural ordering of functional groups within IRMOF pores significantly influences gas sorption properties.
  • PSM techniques offer a powerful route to engineer MOF pore environments for specific applications, such as selective gas storage.
  • Tailoring the arrangement of functional groups is key to achieving desired hysteretic or reversible sorption behaviors in MOFs.