Large polytungstobismuthate aggregate linked by unusual silver–tungsten–bismuth cluster

Abstract A new multi-silver-substituted polyoxometalate Na 19 [Bi 2 Ag 3 Na(W 3 O 10 )(BiW 9 O 33 ) 3 ]·∼41(H 2 O) ( 1 ) has been obtained by reaction of Na 9 [BiW 9 O 33 ]·16H 2 O, Na 2 WO 4 ·2H 2 O, and AgNO 3 in an acidic aqueous solution. The complex is characterized by IR, UV–Vis absorption spectra, thermogravimetric (TG) analysis, elemental analysis, and single crystal X-ray diffraction. Polyanion 1 consists of three [BiW 9 O 33 ] 9− units liked by [Bi 2 Ag 3 Na(W 3 O 10 )] 8+ silver/sodium–tungsten–bismuth mixed cluster. The novelty of polyanion 1 is that, for the first time, use silver cations bridges [BiW 9 O 33 ] 9− subunits to form a new polyoxometalate cluster and providing new insights into the preparation of fascinating multi-functional materials.