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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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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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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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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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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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Towards multifunctional lanthanide-based metal-organic frameworks.

Gerard Tobin1, Steve Comby, Nianyong Zhu

  • 1School of Chemistry and Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), University of Dublin, Trinity College Dublin, Dublin 2, Ireland. schmittw@tcd.ie.

Chemical Communications (Cambridge, England)
|July 25, 2015
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel holmium(III) metal-organic framework with a porous 3D structure. This framework can be modified with lanthanide ions to create tunable near-infrared and visible light emitters.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) offer tunable porosity and diverse functionalities.
  • Lanthanide-based materials are known for their unique photophysical properties, particularly luminescence.

Purpose of the Study:

  • To synthesize and characterize a new holmium(III)-based metal-organic framework.
  • To investigate the structure-property relationships for tunable light emission.

Main Methods:

  • Solvothermal synthesis of the holmium(III)-based MOF.
  • Single-crystal X-ray diffraction for structural analysis.
  • Photophysical characterization (UV-Vis absorption, emission spectroscopy).

Main Results:

  • A novel 3D porous holmium(III)-based MOF was successfully synthesized.
  • The framework exhibits porosity, suitable for potential applications in adsorption or catalysis.
  • Tunable ligand-sensitized near-infrared (NIR) and visible light emission was achieved by varying lanthanide ions.

Conclusions:

  • The developed MOF structure serves as a versatile platform for lanthanide-based luminescent materials.
  • The ability to tune emission across the visible and NIR spectrum opens possibilities for advanced optical devices.