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A transient lanthanum phosphinidene complex.

Fabian A Watt1, Karl N McCabe, Roland Schoch

  • 1Paderborn University, Warburger Straße 100, 33098 Paderborn, Germany.

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|November 25, 2020
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Summary
This summary is machine-generated.

Deprotonation of a lanthanum phosphido complex triggers C-H activation within a PN ligand. This study explores the reaction mechanism, including the potential role of a transient phosphinidene complex, using theoretical and chemical methods.

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Area of Science:

  • Organometallic Chemistry
  • Lanthanide Chemistry
  • Phosphorus Chemistry

Background:

  • Terminal phosphido complexes are versatile precursors in organometallic synthesis.
  • Lanthanide complexes offer unique reactivity due to their electropositive nature.

Purpose of the Study:

  • To investigate the C-H activation reaction of a terminal phosphido complex.
  • To elucidate the reaction mechanism and identify key intermediates.
  • To assess the thermal stability of the resulting complexes.

Main Methods:

  • Deprotonation of the phosphido complex (PN)₂La(PHMes).
  • Theoretical calculations and chemical investigations.
  • Deuteration experiments using (PN)₂La(PDMes).
  • Thermal stability studies of the product [K(2.2.2-cryptand)][(PN)(PNcyclo)La(PHMes)].

Main Results:

  • C-H activation of a PN ligand was observed upon deprotonation.
  • Evidence for the involvement of a transient phosphinidene complex was explored.
  • The thermal decomposition pathway leads to a diphosphido complex.

Conclusions:

  • The study reveals a novel C-H activation pathway in lanthanide phosphido complexes.
  • Understanding these mechanisms is crucial for designing new synthetic routes.
  • The thermal stability analysis provides insights into the decomposition pathways of these organometallic compounds.