Synthesis and Computational Analysis of Uranium(III)-Pnictogen Bonds.

Area of Science:

• Inorganic Chemistry
• Organometallic Chemistry
• Actinide Chemistry

Background:

• Uranium(III) complexes are crucial for understanding bonding in actinides.
• Pnictogen elements (N, P, As, Sb, Bi) offer diverse electronic properties.
• Elucidating covalency in actinide-pnictogen bonds is key to predicting chemical behavior.

Purpose of the Study:

• To synthesize and characterize novel uranium(III)-pnictogen complexes.
• To investigate the electronic environment and bonding character of uranium(III)-phosphorus and uranium(III)-arsenic bonds.
• To establish trends in covalency and interaction energy across the pnictogen group.

Main Methods:

• Synthesis of uranium(III)-pnictogen complexes (1-PMes2 and 1-AsMes2).
• Characterization using UV-vis NIR spectroscopy.
• Computational analysis of bonding in uranium(III) complexes with N, P, As, Sb, and Bi.

Main Results:

• Successful synthesis and characterization of the first uranium(III)-arsenic complex.
• Similar electronic environments observed for uranium(III)-phosphorus and uranium(III)-arsenic bonds.
• Computational data show decreased bond covalency and interaction energy down the pnictogen group.

Conclusions:

• Bond covalency between uranium(III) and pnictogens decreases with increasing pnictogen atomic number.
• Interaction energies diminish down the pnictogen group.
• This work deepens the understanding of bonding between hard actinide and soft pnictogen centers.