Uranyl-peroxide interactions favor nanocluster self-assembly

Area of Science:

• Inorganic Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Uranyl peroxide polyhedra are known to self-assemble into complex closed clusters.
• These clusters can exhibit fullerene and other intricate topologies.
• Existing structures contain up to 60 polyhedra.

Purpose of the Study:

• To isolate and characterize uranyl peroxide clusters with the smallest possible fullerene topology.
• To investigate the structural features, specifically the U-O(2)-U dihedral angle, that govern self-assembly.
• To understand the principles of uranyl peroxide cluster formation.

Main Methods:

• Isolation and characterization of specific uranyl peroxide clusters.
• Crystallization of larger cluster fragments using oxalate.
• Analysis of structural data to determine bond angles and topologies.

Main Results:

• Clusters containing 20 uranyl pentagonal triperoxides were isolated and characterized.
• These clusters exhibit the smallest fullerene topology, comprising only 12 pentagons.
• Crystallized fragments and known structures reveal an inherently bent U-O(2)-U dihedral angle.

Conclusions:

• The smallest fullerene topology in uranyl peroxide clusters consists of 12 pentagons.
• The bent U-O(2)-U dihedral angle is a critical factor in directing the self-assembly of uranyl peroxide polyhedra.
• This finding provides insight into the fundamental mechanisms of uranyl peroxide cluster formation.