Oxygen-atom vacancy formation and reactivity in polyoxovanadate clusters.

Area of Science:

• Heterogeneous catalysis
• Inorganic chemistry
• Materials science

Background:

• Reducible metal oxides (RMOs) are crucial for converting simple molecules into valuable chemical fuels and feedstocks.
• The catalytic activity of RMOs is often linked to oxygen-atom vacancies, but their direct study is challenging.
• Homogeneous molecular models, like polyoxometalates, offer an alternative approach to study these vacancies.

Purpose of the Study:

• To explore polyoxovanadate-alkoxide clusters as homogeneous molecular models for bulk vanadium oxide.
• To synthesize and characterize oxygen-deficient vanadium oxide assemblies.
• To investigate the catalytic potential of these oxygen-deficient sites in reductive transformations.

Main Methods:

• Synthesis of polyoxovanadate-alkoxide clusters using V(Mes)3(thf), tertiary phosphanes, and organic acids.
• Utilizing plenary Lindqvist motifs as precursors.
• Characterization of oxygen-deficient vanadium oxide assemblies.

Main Results:

• Successful synthesis of various oxygen-deficient polyoxovanadate-alkoxide clusters.
• Demonstration of these clusters as effective homogeneous models for vanadium oxide.
• Evidence for the ability of oxygen-deficient sites to mediate O2 and NOx activation.

Conclusions:

• Polyoxovanadate-alkoxide clusters serve as valuable homogeneous models for studying vanadium oxide catalysis.
• Oxygen-deficient sites within these clusters are key to their catalytic activity.
• These models provide a pathway to understand and design RMOs for challenging reductive transformations.