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Researchers isolated and characterized diatomic carbon (C2) in a stable, monoligated complex. This breakthrough provides new insights into the unique bonding and reactivity of C2, previously only observed indirectly.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Diatomic carbon (C2) is a highly reactive species, typically observed only indirectly in the gas phase.
  • Previous attempts to stabilize C2 in condensed phases have resulted in compounds where its bonding differs from free C2.

Purpose of the Study:

  • To prepare and structurally characterize a stable, isolable form of diatomic carbon (C2).
  • To investigate the bonding and reactivity of this novel C2 complex.

Main Methods:

  • Synthesis of a monoligated C2 complex using a bulky phosphine ligand with N-heterocyclic carbene groups.
  • Structural characterization via X-ray diffraction.
  • Quantum chemical analysis.
  • Reactivity studies including thermolysis and reactions with methanol.

Main Results:

  • Successful preparation and isolation of a stable, monoligated diatomic carbon (C2) complex, L→C2.
  • Structural data and quantum chemical analysis indicate carbene character for both carbon atoms in the C2 unit.
  • The complex demonstrated reactivity, including intermolecular C-H bond activation and hydroalkoxylation-like reactions.

Conclusions:

  • This work presents the first stable, structurally characterized monoligated diatomic carbon (C2) complex.
  • The findings offer a new perspective on the electronic structure and chemical behavior of C2.
  • The stabilized C2 complex serves as a platform for exploring novel carbon-based chemical transformations.