Synthesis and characterization of new tungstosilicate aggregates assembled with a mixture of mono- and trivacant Keggin fragments

The reaction of K8[α-SiW11O39] and Na9[A-β-SiW9O34H] in aqueous solution with different pH values led to the isolation of two new polyoxoanions [Si3W26O94]20− (1) and [Si2W19O69(H2O)]16− (2), which are firstly observed in tungstosilicates family.