Two Different Three-Dimensional Uranium-Containing Polymolybdates Based on Zn(II) for the Heterogeneous Catalytic Construction of C–N Bond

Abstract

The introduction of transition metal (TM) ions into polyoxometalates (POMs) cannot only bring about interesting structural diversities but also enable changes in properties. However, TM-containing Silverton-type polyoxomolybdates are still lacking in terms of structural diversity and application development. Herein, two Zn(II)-containing Silverton-type {UMo₁₂O₄₂}-based polyoxomolybdates, H_1.89Na_4.11(H₂O)₉Zn[UMo₁₂O₄₂]·4.5H₂O (<b>Zn-1</b>) and H_1.8Na_4.2(H₂O)₁₂Zn[UMo₁₂O₄₂] (<b>Zn-2</b>) were hydrothermally synthesized, demonstrating a practical strategy to assembly of TM-containing Silverton-type POMs. <b>Zn-1</b> is proven to be an excellent and recyclable heterogeneous catalyst in cross-dehydrogenation coupling of 1,4-naphthoquinones with amines reactions, and a series of 2-amino-1,4-naphthoquinones with potential medicinal value have been constructed.