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The title compound, (C 10 H 10 N 2 ) 2 [SiW 12 O 40 ]·C 10 H 8 N 2 ·6H 2 O or (4,4′-bipyH 2 ) 2 [SiW 12 O 40 ].(4,4′-bipy)·6H 2 O (4,4′-bipy is 4,4′-bipyridine), was prepared under hydro­thermal conditions. The asymmetric unit contains a discrete Keggin-type [SiW 12 O 40 ] 4−  anion (located on a twofold axis), one 4,4′-bipy (located on a twofold axis), two (4,4′-bipyH 2 ) 2+  cations and six uncoordinated water mol­ecules. The polyoxoanion is constructed from a central SiO 4  tetra­hedron which shares its O atoms with four trinuclear W 3 O 13  groups, each of which is made up of three edge-sharing WO 6  octa­hedra. The water mol­ecules and [SiW 12 O 40 ] 4−  anions are linked through hydrogen bonds.

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