Molecular 1,1'-bifunctional mixed-valence P-P compounds, enabled through metal complexation.

Area of Science:

• Inorganic Chemistry
• Main Group Chemistry
• Organometallic Chemistry

Background:

• Mixed-valence compounds are well-studied in solid-state metal chemistry.
• Molecular main group mixed-valence compounds, especially with bifunctional groups, present synthetic challenges.
• Establishing 1,1'-bifunctional groups in main group chemistry is a significant hurdle.

Purpose of the Study:

• To synthesize and characterize 1,1'-bifunctional mixed-valence main group compounds featuring a P-P bond.
• To investigate the role of metal complex fragments in the reactivity of these compounds.
• To explore the ambident reactivity of novel dinuclear diphosphene complexes.

Main Methods:

• Generation of a transient phosphanylidene-phosphinidenoid complex.
• Synthesis of a dinuclear diphosphene complex.
• X-ray diffraction studies for structural confirmation.
• Density Functional Theory (DFT) calculations for electronic structure and reaction pathway analysis.

Main Results:

• A novel dinuclear diphosphene complex with unprecedented ambident reactivity was synthesized.
• The complex undergoes either 1,2-addition or 1,1-addition depending on the reagent.
• Stable, previously unknown 1,1'-bifunctional phosphanylidene-phosphorane complexes were obtained via 1,1-addition.
• X-ray diffraction confirmed the structures of the 1,1-addition products.

Conclusions:

• The study successfully established 1,1'-bifunctional mixed-valence main group compounds with a P-P bond.
• The metal complex fragments play a crucial role in directing the reactivity of the diphosphene complex.
• The discovered compounds offer new avenues for exploring main group chemistry and developing novel functional materials.