Acta Cryst. (2008). E64, m1224  [ doi:10.1107/S1600536808027566 ]

Bis(4,4'-bipyridinium) dodecatungstosilicate 4,4'-bipyridine hexahydrate

F.-X. Ma and Q. Zhao

Abstract: The title compound, (C₁₀H₁₀N₂)₂[SiW₁₂O₄₀]·C₁₀H₈N₂·6H₂O or (4,4'-bipyH₂)₂[SiW₁₂O₄₀].(4,4'-bipy)·6H₂O (4,4'-bipy is 4,4'-bipyridine), was prepared under hydrothermal conditions. The asymmetric unit contains a discrete Keggin-type [SiW₁₂O₄₀]^4- anion (located on a twofold axis), one 4,4'-bipy (located on a twofold axis), two (4,4'-bipyH₂)²⁺ cations and six uncoordinated water molecules. The polyoxoanion is constructed from a central SiO₄ tetrahedron which shares its O atoms with four trinuclear W₃O₁₃ groups, each of which is made up of three edge-sharing WO₆ octahedra. The water molecules and [SiW₁₂O₄₀]^4- anions are linked through hydrogen bonds.

Online 6 September 2008

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