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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 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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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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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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Accessing a Highly Reducing Uranium(III) Complex through Cyclometalation.

Dieuwertje K Modder1, Rosario Scopelliti1, Marinella Mazzanti1

  • 1Group of Coordination Chemistry, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

Inorganic Chemistry
|January 13, 2024
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Summary

Researchers synthesized a novel Uranium(III) complex, demonstrating its potent reducing capabilities and ability to form new chemical structures. This discovery expands the known reactivity of low-valent uranium compounds.

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Area of Science:

  • Organometallic Chemistry
  • Uranium Chemistry
  • Inorganic Chemistry

Background:

  • Uranium(IV) cyclometalated complexes exhibit diverse reactivity.
  • Low oxidation state uranium analogues are scarce, limiting exploration of their chemistry.

Purpose of the Study:

  • To report the synthesis and characterization of a novel Uranium(III) cyclometalated complex.
  • To investigate the reducing abilities and reactivity of this Uranium(III) complex.

Main Methods:

  • Reduction of a Uranium(III) precursor using KC8 and 2.2.2-cryptand.
  • Cyclic voltammetry to determine reduction potentials.
  • Reactions with various substrates (e.g., bipyridines, azides) to assess reactivity.

Main Results:

  • Isolation of [K(2.2.2-cryptand)][U(III){N(SiMe3)2}2(κ2-C,N-CH2SiMe2NSiMe3)], a novel Uranium(III) complex.
  • The complex exhibits reduction potentials comparable to Uranium(II) analogues.
  • Demonstrated reducing abilities with multiple substrates, including pyridine, a first for mononuclear Uranium(III).
  • Successful insertion of various substrates into the U-C bond, forming new Uranium(III) metallacycles.

Conclusions:

  • Cyclometalated Uranium(III) complexes are versatile precursors.
  • These complexes enable a broad range of reactivity and the construction of novel chemical architectures.
  • The study expands the scope of low-valent uranium chemistry and its synthetic applications.