Ce^IV ₇₀ Oxosulfate Rings, Frameworks, Supramolecular Assembly, and Redox Activity*

Area of Science:

• Materials Science
• Inorganic Chemistry
• Nanotechnology

Background:

• Metal(IV) molecular oxo-clusters are crucial for materials design, catalysis, and understanding reaction mechanisms.
• Developing new clusters is essential for advancing these fields.

Purpose of the Study:

• To introduce Ce70, a novel wheel-shaped oxo-cluster.
• To explore its crystallization into high pore volume frameworks.
• To investigate its potential in catalysis and materials design.

Main Methods:

• Synthesis and crystallization of the Ce70 oxo-cluster.
• Structural characterization using X-ray crystallography.
• Small-angle X-ray scattering (SAXS) to study solution behavior and supramolecular assembly.
• Ion-exchange experiments to demonstrate framework functionality.

Main Results:

• The Ce70 cluster, [CeIV70(OH)36(O)64(SO4)60(H2O)10]4-, forms intricate, high pore volume frameworks with various linking strategies.
• Eight crystal structures reveal four distinct framework types based on Ce70 ring arrangements.
• SAXS studies show metal-dependent supramolecular assembly in solution.
• Demonstrated ion-exchange capabilities with U(IV) and Nd(III) ions.
• Frameworks exhibit redox activity with Ce(III/IV) linkers.

Conclusions:

• The Ce70 cluster serves as a versatile building block for creating novel porous frameworks.
• These frameworks hold promise for applications in mixed-metal catalysis and metal-organic framework design.
• The study highlights the potential for developing new functional materials based on oxo-cluster chemistry.