A polyoxometalate-based Pd(II)-coordinated ionic solid catalyst for heterogeneous aerobic oxidation of benzene to biphenyl.

An ionic solid catalyst by pairing Keggin polyoxometalate-anions with Pd(II)-coordinated nitrile-tethered ionic liquid cations was synthesized, characterized, and tested for aerobic oxidation of benzene to biphenyl. A unique heterogeneous intramolecular electron transfer mechanism is proposed to understand its high activity.

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