Atomically Precise Silver Clusters Stabilized by Lacunary Polyoxometalates with Photocatalytic CO2 Reduction Activity

Abstract The syntheses of atomically precise silver (Ag) clusters stabilized by multidentate lacunary polyoxometalate (POM) ligands have been emerging as a promising but challenging research direction, the combination of redox‐active POM ligands and silver clusters will render them unexpected geometric structures and catalytic properties. Herein, we report the successful construction of two structurally‐new lacunary POM‐stabilized Ag clusters, TBA 6 H 14 Ag 14 (DPPB) 4 (CH 3 CN) 9 [Ag 24 (Si 2 W 18 O 66 ) 3 ] ⋅ 10CH 3 CN ⋅ 9H 2 O ( {Ag 24 (Si 2 W 18 O 66 ) 3 } , TBA=tetra‐ n ‐butylammonium, DPPB=1,4‐Bis(diphenylphosphino)butane) and TBA 14 H 6 Ag 9 Na 2 (H 2 O) 9 [Ag 27 (Si 2 W 18 O 66 ) 3 ] ⋅ 8CH 3 CN ⋅ 10H 2 O ( {Ag 27 (Si 2 W 18 O 66 ) 3 } ), using a facile one‐pot solvothermal approach. Under otherwise identical synthetic conditions, the molecular structures of two POM‐stabilized Ag clusters could be readily tuned by the addition of different organic ligands. In both compounds, the central trefoil‐propeller‐shaped {Ag 24 } 14+ and {Ag 27 } 17+ clusters bearing 10 delocalized valence electrons are stabilized by three C‐shaped {Si 2 W 18 O 66 } units. The femtosecond/nanosecond transient absorption spectroscopy revealed the rapid charge transfer between {Ag 24 } 14+ core and {Si 2 W 18 O 66 } ligands. Both compounds have been pioneeringly investigated as catalysts for photocatalytic CO 2 reduction to HCOOH with a high selectivity.