Scheme 1. Diagram Showing the Rich Structural Diversity, Applications, and Speciation Behavior of the Dilacunary {γ-SiW₁₀O₃₆}.

Top left: Ru-derived {Ru₄Si₂W₂₀} is a highly promising water oxidation catalyst, and Mn-derived compound {Mn₆Si₂W₁₈} is a Mn^II/III-based single-molecule magnet. Top right: several examples of high-nuclearity transition-metal-substituted polyoxometalate clusters. Bottom: Remarkable isomerism of tungstosilicate species showing the relationships between different known structures. Color code for polyhedra: W = teal, Si = orange; ball-and-stick: O = red, Ru = black, Mn = lavender, Cu = green, Ti = white.