K₆H₂[TiW₁₁CoO₄₀]·13H₂O, with a mono­titanoundeca­tungstocobaltate(II) anion

Hexapotassium dihydrogen monotitanoundeca­tungsto­cobalt­ate(II) trideca­hydrate, K₆H₂[TiW₁₁CoO₄₀]·13H₂O, crystallizes from aqueous solution in the cubic space group P3m. The structure was refined as an inversion twin. The [TiW₁₁CoO₄₀]^8- anion has a Keggin structure with one W-atom site occupied by titanium and a central tetra­hedral CoO₄ group.