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In the title complex, [Cu 2 V 8 O 21 (2,2′-bpy) 2 ]  n   (bpy = bipyridine, C 10 H 8 N 2 ), the asymmetric unit contains four independent V atoms briged by 11 O atoms, one of which lies on an inversion center, and a [Cu(2,2′-bpy)] 2+  unit. Three V atoms in the polyoxoanion exhibit distorted tetra­hedral coordination geometries while the fourth V atom adopts a trigonal-bipyramidal geometry. The Cu atom adopts a square-pyramidal geometry being coordinated by two nitro­gen donors of a 2,2′-bpy ligand, and three bridging O atoms which are linked with V atoms. The V 8  polyoxoanion is connected to [Cu(2,2′-bpy)] 2+  cations, resulting in a two-dimensional layer structure extending parallel to (010). C—H⋯O hydrogen bonding consolidates the structure.

Poly[bis(2,2′-bipyridine-κ2N,N′)heptadeca-μ-oxido-tetraoxidodicopper(II)divanadate(IV)hexavanadate(V)]

Poly[bis(2,2′-bipyridine-κ²N,N′)heptadeca-μ-oxido-tetraoxidodicopper(II)divanadate(IV)hexavanadate(V)]