An Au₈ Cluster Fortified by Four Ferrocenes

Area of Science:

• Nanomaterials Science
• Catalysis
• Organometallic Chemistry

Background:

• Atomically precise metal clusters are gaining attention due to structure-property relationships.
• Understanding cluster formation and stabilization is crucial for catalytic applications.

Purpose of the Study:

• To synthesize and characterize a novel gold cluster (Au₈) stabilized by ferrocene ligands (DPPF).
• To investigate the catalytic activity of the Au₈(DPPF)₄ clusters in CO oxidation.
• To elucidate the role of ferrocene ligands in cluster formation, stability, and catalytic enhancement.

Main Methods:

• Synthesis of Au₈ clusters capped with ferrocene ligands (DPPF).
• Characterization of the cluster structure and composition.
• Evaluation of catalytic performance in CO oxidation reactions.
• Analysis of catalyst stability under reaction conditions.

Main Results:

• Successful synthesis of Au₈(DPPF)₄ clusters with precise atomic arrangement.
• Demonstrated efficient heterogeneous catalysis for CO oxidation.
• Observed resistance of the clusters to aggregation under reaction conditions.
• Identified homolytic phosphine dissociation and postdissociation reconstruction induced by iron as key factors for enhanced catalysis.

Conclusions:

• Ferrocene ligands effectively direct and stabilize the formation of Au₈ clusters.
• The Au₈(DPPF)₄ clusters exhibit excellent catalytic activity and stability for CO oxidation.
• Iron-mediated electronic effects play a significant role in enhancing the catalytic performance of these gold clusters.