Combination between [B-α-SiW9O34] unit and triangular inorganic Ni6 core under hydrothermal conditions: from monomer to rare dimer with malposed dodeca-nickel centers

Abstract

The hydrothermal reactions of α-K₄SiW₁₂O₄₀ with NiCl₂·6H₂O yielded two unprecedented silicotungstates containing a triangular inorganic Ni₆ core. Furthermore, Na₂[Ni₆(μ₃-OH)₃(H₂O)₉SiW₉O₃₄]₂·17H₂O (1) presents a rare dimer, in which two SiW₉ units sandwich double Ni₆ cores by W–O–Ni linking instead of conventional Ni–O–Ni.