Dioxygen in Polyoxometalate Mediated Reactions.

Area of Science:

• Inorganic Chemistry
• Catalysis
• Materials Science

Background:

• Polyoxometalates (POMs) are soluble anionic metal oxide clusters.
• POMs are effective homogeneous catalysts for electron transfer oxidations.
• POMs can be reoxidized by molecular oxygen, enabling aerobic catalysis.

Purpose of the Study:

• To review the use of molecular oxygen in POM-mediated reactions.
• To highlight the diverse catalytic capabilities of POMs with oxygen.
• To explore unique oxygen transfer and dioxygenase-like activities of POMs.

Main Methods:

• Review of literature on polyoxometalate catalysis.
• Discussion of electron transfer mechanisms involving POMs and O2.
• Analysis of POM-stabilized metal nanoparticles in aerobic reactions.

Main Results:

• POMs, such as H5PV2Mo10O40, enable palladium-catalyzed aerobic oxidations.
• POMs facilitate electron transfer oxidation of various substrates (halides, sulfur compounds).
• Unique oxygen atom transfer from POMs to substrates enables C-C, C-H, and C-M bond activation.

Conclusions:

• Polyoxometalates are versatile catalysts for aerobic transformations.
• POMs exhibit distinct electron transfer and oxygen transfer mechanisms.
• POMs show potential for dioxygenase-like activity, broadening their catalytic scope.