Isolation of a stable lacunary Dawson-type polyoxomolybdate cluster

Area of Science:

• Inorganic Chemistry
• Materials Science
• Electrochemistry

Background:

• Polyoxomolybdates are versatile inorganic clusters with diverse structures and properties.
• The Wells-Dawson structure is a well-known polyoxometalate framework.
• Controlling the synthesis and redox properties of these clusters is crucial for their applications.

Purpose of the Study:

• To synthesize and characterize a novel polyoxotetradecamolybdate cluster with a lacunary Wells-Dawson core.
• To investigate the mixed-valence nature and redox behavior of the synthesized cluster.
• To explore the potential of this cluster in electrochemical applications.

Main Methods:

• Reduction of hexamolybdate ([Mo(6)O(19)](2-)) to form the polyoxotetradecamolybdate cluster.
• Isolation and characterization of the [Mo(14)O(38)(OAc)(6)](2-) cluster.
• Electrochemical studies to determine multi-step redox processes.

Main Results:

• Successful isolation of the polyoxotetradecamolybdate cluster [Mo(14)O(38)(OAc)(6)](2-).
• The cluster possesses a lacunary Wells-Dawson core structure.
• The Mo(14) core exhibits a mixed valence of Mo(V)(4)Mo(VI)(10).
• Multi-step reversible redox processes (oxidation and reduction) were observed.

Conclusions:

• A novel mixed-valence polyoxomolybdate cluster has been synthesized and characterized.
• The cluster's structure and redox properties are linked to its potential applications.
• This research opens avenues for designing advanced inorganic materials with tunable electrochemical properties.