Cage-like Cu₅Cs₄-Phenylsilsesquioxanes: Synthesis, Supramolecular Structures, and Catalytic Activity

Area of Science:

• Inorganic Chemistry
• Materials Science
• Catalysis

Background:

• Silsesquioxanes are a class of compounds with a unique cage-like structure.
• Metal-oxo clusters offer diverse structural motifs and catalytic properties.

Purpose of the Study:

• To synthesize and characterize novel nonanuclear copper-cesium phenylsilsesquioxane clusters.
• To investigate the catalytic activity of these clusters in oxidation reactions.

Main Methods:

• Self-assembly approach for cluster synthesis.
• X-ray diffraction studies for structural characterization.
• Catalytic evaluation in Baeyer-Villiger oxidation and alkane oxidation reactions.

Main Results:

• Two nonanuclear Cu5Cs4-based phenylsilsesquioxanes, compounds 1 and 2, were successfully synthesized.
• Unprecedented structural features include a [Ph14Si14O28]14- silsesquioxane ligand and unusual metal cation positions.
• Compound 2 demonstrated high catalytic activity in the Baeyer-Villiger oxidation of cyclohexanone and oxidation of alkanes and alcohols.

Conclusions:

• The synthesized Cu-Cs phenylsilsesquioxanes represent a new class of inorganic compounds with unique structures.
• These clusters show significant potential as catalysts in various oxidation processes.
• The findings open avenues for designing novel catalysts based on silsesquioxane frameworks.