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Metal-Ligand Bonds02:51

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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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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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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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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...
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Binding methane to a metal centre.

James D Watson1, Leslie D Field1, Graham E Ball2

  • 1School of Chemistry, UNSW Sydney, Sydney, NSW, Australia.

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|April 26, 2022
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This summary is machine-generated.

Researchers created a stable organometallic complex where methane binds to osmium. This advances understanding of alkane C-H bond activation and methane

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Catalysis

Background:

  • Transition metal σ-alkane complexes are key intermediates in alkane C-H bond activation.
  • Methane, the simplest alkane, exhibits weak binding to metal centers compared to larger alkanes.

Purpose of the Study:

  • To synthesize and characterize a long-lived methane complex with a transition metal.
  • To investigate the binding mode and stability of methane as a ligand.

Main Methods:

  • Photo-ejection of carbon monoxide from a cationic osmium-carbonyl complex.
  • Formation of the osmium(II) complex [η⁵-CpOs(CO)₂(CH₄)]⁺ in a methane-saturated hydrofluorocarbon solvent at -90°C.
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

  • A stable σ-methane complex, [η⁵-CpOs(CO)₂(CH₄)]⁺, was successfully formed and identified.
  • NMR spectroscopy confirmed the methane ligand's structure and revealed rapid proton exchange.
  • The methane complex exhibited a half-life of approximately 13 hours at -90°C.

Conclusions:

  • Direct binding of methane as an incoming ligand to a reactive organometallic complex is achievable.
  • The synthesized osmium-methane complex provides a valuable model for studying C-H bond activation mechanisms.
  • This work demonstrates the potential for stabilizing weakly bound alkane ligands in organometallic chemistry.