Synthesis, molecular structure and chemical properties of a new tungstosilicate with an open Wells-Dawson structure, alpha-[Si2W18O66]16-.
Acidification of K10A-alpha-[SiW9O34] in aqueous solution leads to the formation of alpha-[Si2W18O66]16-, built up from two A-alpha-[SiW9O34] subunits, which reacts with metal cations to form potassium and mixed potassium-transition metal complexes.