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The title compound, (NH 4 ) 4 (C 4 H 12 N 5 ) 2 [V 10 O 28 ]·6H 2 O, crystallizes with the decavanadate anion placed on an inversion centre in space group  P \overline{1}. This anion is surrounded by a first shell of ammonium cations and water molecules, forming efficient N—H...O and O—H...O hydrogen bonds. A second shell includes metforminium monocations with a twisted geometry, also forming numerous intermolecular hydrogen bonds. The complex three-dimensional network of non-covalent interactions affords a crystal structure in which the cations and anions are densely packed.

Tetraammonium bis(metforminium) di-μ6-oxido-tetra-μ3-oxido-tetradeca-μ2-oxido-octaoxidodecavanadium(V) hexahydrate

Tetraammonium bis(metforminium) di-μ₆-oxido-tetra-μ₃-oxido-tetradeca-μ₂-oxido-octaoxidodecavanadium(V) hexahydrate