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metal-organic compounds
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 NiII ions. The anion and coordinated NiII 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.