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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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Crystal Field Theory
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Multigas adsorption with single-site cooperativity in a metal-organic framework.

Kurtis M Carsch1,2, Henry Z H Jiang1,2,3, Ryan A Klein4,5

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|November 20, 2025
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This study showcases a metal-organic framework (MOF) with cobalt(II)-methyl sites that achieve record carbon monoxide (CO) adsorption capacities. The MOF exhibits cooperative CO binding, forming an acetyl group and demonstrating sigmoidal adsorption isotherms.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Cooperative gas adsorption in metal-organic frameworks (MOFs) is rare, typically requiring long-range interactions.
  • Understanding cooperative adsorption mechanisms is key to designing advanced gas capture materials.

Purpose of the Study:

  • To demonstrate a novel MOF with cooperative carbon monoxide (CO) adsorption capabilities.
  • To elucidate the mechanism behind the observed cooperative adsorption and high capacities.

Main Methods:

  • Synthesis and characterization of a cobalt(II)-methyl functionalized MOF.
  • Gas adsorption experiments at ambient conditions.
  • Structural, spectroscopic, and computational analyses to probe the adsorption mechanism.

Main Results:

  • The MOF selectively captures two CO molecules per cobalt(II)-methyl site, achieving record capacities.
  • Adsorption of the first CO triggers a spin transition, facilitating the binding of a second CO.
  • The first CO molecule undergoes migratory insertion into the cobalt-methyl bond, forming an acetyl group.
  • Sigmoidal adsorption isotherms were observed, indicative of cooperativity.

Conclusions:

  • The MOF exhibits unprecedented cooperative CO adsorption without long-range framework interactions.
  • The mechanism involves a spin transition and migratory insertion, leading to enhanced binding affinity.
  • This work presents a new paradigm for designing MOFs with cooperative gas adsorption properties.