P-P σ-bond activation by gold(I) coordination.

Area of Science:

• Organometallic Chemistry
• Catalysis
• Inorganic Chemistry

Background:

• Gold complexes exhibit significant catalytic potential.
• Activation of chemical bonds is crucial for catalytic processes.
• Azadiphosphiridines contain a reactive P-P sigma bond.

Purpose of the Study:

• To investigate the activation of the P-P bond in azadiphosphiridines by gold complexes.
• To synthesize and characterize gold(I) complexes with novel PNP ligands.
• To elucidate the bonding nature within the resulting gold complex.

Main Methods:

• Coordination chemistry involving AuCl and azadiphosphiridine.
• Synthesis of gold(I) complexes.
• Spectroscopic characterization.
• Computational studies (e.g., DFT) to analyze bonding.

Main Results:

• Coordination of an AuCl fragment to the P-P σ-bond of azadiphosphiridine.
• Cleavage of the P-P bond, yielding a PNP-type ligand coordinated to gold(I).
• Selective binding of a second gold precursor to a phosphorus lone pair.
• Computational analysis confirmed a 3-center-2-electron (3c-2e) bonding interaction.

Conclusions:

• Gold complexes can effectively activate P-P bonds in azadiphosphiridines.
• This activation leads to the formation of valuable PNP ligands for gold catalysis.
• The presence of a 3c-2e bond is key to the observed reactivity and bonding.