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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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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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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Intermediate Binding Control Using Metal-Organic Frameworks Enhances Electrochemical CO2 Reduction.

Dae-Hyun Nam1, Osama Shekhah2, Geonhui Lee1

  • 1Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

Journal of the American Chemical Society
|December 15, 2020
PubMed
Summary
This summary is machine-generated.

Metal-organic frameworks (MOFs) control intermediate binding in electrochemical CO2 reduction, enhancing CO selectivity. This reticular chemistry approach optimizes silver nanoparticle catalysis for efficient carbon dioxide conversion.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Controlling intermediate binding is crucial for tuning product selectivity and activity in electrochemical CO2 reduction (CO2RR).
  • Metal-organic frameworks (MOFs) offer a platform for encapsulating metal catalysts and tuning their local environment.

Purpose of the Study:

  • To utilize reticular chemistry in MOFs to control CO2RR intermediate binding on encapsulated metal catalysts.
  • To enhance CO2RR electrocatalysis by optimizing MOF properties like pore openness and Lewis acidity.

Main Methods:

  • Systematic variation of organic linkers and metal nodes in face-centered cubic (fcc) MOFs.
  • Encapsulation of silver (Ag) nanoparticles within the MOFs.
  • Operando X-ray absorption spectroscopy (XAS) and in situ Raman spectroscopy for characterization under reaction conditions.

Main Results:

  • MOFs demonstrated stability under operating conditions for CO2RR.
  • Tuning MOF properties optimized the *CO binding mode on Ag nanoparticles.
  • CO selectivity improved from 74% to 94% using a naphthalene dicarboxylic acid linker compared to a benzene dicarboxylic acid linker.

Conclusions:

  • Reticular chemistry provides an effective strategy to design MOFs for enhanced CO2RR.
  • MOF-encapsulated catalysts enable precise control over intermediate binding, leading to improved CO selectivity.
  • This work presents a new materials design approach for CO2RR using MOFs.