The df-d Dative Bonding in a Uranium-Cobalt Heterobimetallic Complex for Efficient Nitrogen Fixation

Area of Science:

• Inorganic Chemistry
• Catalysis
• Materials Science

Background:

• Nitrogen fixation is crucial for ammonia production.
• Single-transition-metal catalysts with s-, p-, or d-block anchors are well-studied.
• F-block atom anchors for nitrogen fixation catalysts are rarely reported.

Purpose of the Study:

• Investigate the feasibility of using an f-block atom anchor (uranium) for nitrogen fixation.
• Explore a novel U-Co complex for converting nitrogen (N₂) to ammonia (NH₃).
• Utilize theoretical modeling to understand the catalytic mechanism.

Main Methods:

• Ab initio density matrix renormalization group (DMRG) calculations.
• Characterization of oxidation state evolution for U and Co during the reaction.
• Analysis of metal-to-metal dative bond variations.

Main Results:

• The U-Co complex facilitates N₂ to NH₃ conversion.
• The Co → U dative bond strength correlates with oxidation state changes.
• Both uranium and cobalt act as electron reservoirs, aiding N-N bond cleavage.
• Demonstrated the viability of df-d metal-to-metal dative bonds in catalysis.

Conclusions:

• Uranium as an f-block anchor is feasible for nitrogen fixation catalysts.
• Metal-to-metal dative bonds, specifically df-d, are effective for N₂ reduction.
• This work opens new avenues for designing efficient nitrogen fixation catalysts.