A neutral diphosphene radical: synthesis, electronic structure and white phosphorus activation

Area of Science:

• Organophosphorus Chemistry
• Radical Chemistry
• Inorganic Synthesis

Background:

• Diphosphenes are unsaturated phosphorus compounds with a P=P double bond.
• Neutral, mixed-substituted diphosphene radicals are rare and possess unique reactivity.
• Understanding their synthesis and reactions is crucial for developing new phosphorus-based materials.

Purpose of the Study:

• To synthesize a novel neutral, mixed-substituted diphosphene radical.
• To investigate the reactivity of this radical with white phosphorus (P4).
• To characterize the resulting phosphorus-rich compound.

Main Methods:

• Reduction of precursor compounds (2[OTf] and 3) using cobaltocene (CoCp2).
• Reaction of the synthesized diphosphene radical (1˙) with white phosphorus (P4).
• Characterization of the products using spectroscopic and analytical techniques.

Main Results:

• Successful synthesis of the neutral, mixed-substituted diphosphene radical (ClImDipp)P-P(Dipp)˙ (1˙).
• Demonstration of 1˙'s ability to activate white phosphorus (P4).
• Formation of an octaphosphane butterfly compound, P8(ClImDipp)2(Dipp)2 (4).

Conclusions:

• The study reports a rare neutral diphosphene radical with significant reactivity.
• The radical serves as an effective activator for white phosphorus.
• A novel octaphosphane butterfly structure was obtained, highlighting new avenues in phosphorus cluster chemistry.