[Ni(C₁₀H₈N₂)₃]₂[V₄O₁₂].11H₂O

The crystal structure of the title compound, bis[tris(2,2'-bipyridyl-N,N')nickel(II)] cyclo-tetravanadate undecahydrate, contains a centrosymmetric [V₄O₁₂]^4- anion, which has an eight-membered ring structure formed by four VO₄ tetrahedra sharing vertices, and two complex cations, containing octahedrally coordinated Ni^II ions. The anion and coordinated Ni^II ions are isolated and make up anion and cation layers, respectively. The Ni-N distances range from 2.077 (3) to 2.112 (2) Å and the V-O distances range from 1.621 (2) to 1.803 (2) Å.

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