Isolation of extendable transition metal incorporated polyoxometalate intermediates with structural control

Abstract

Three discrete cobalt-substituted silicotungstates, [Co₃(H₂O)(B-β-SiW₉O₃₄)(B-β-SiW₈O₂₉(OH)₂)]¹²⁻ (1), [Co₃(H₂O)(B-α-SiW₉O₃₄)(B-β-SiW₈O₃₁)]¹⁴⁻ (2), and [Co₉Cl₂(OH)₃(H₂O)₉(B-β-SiW₈O₃₁)₃]¹⁷⁻ (3), have been synthesized using a synthetic approach involving Co(II) ions, the dilacunary [γ-SiW₁₀O₃₆]⁸⁻polyanion and a bulky organic cation in basic media; all three compounds have been fully characterized and their position as structural intermediates in Co-containing silicotungstate chemistry is described.