(μ-Oxalato-κ(4) O (1),O (2):O (1′),O (2′))bis­[bis­(2,2′-bipyridine-κ(2) N,N′)cobalt(II)] μ(6)-oxido-dodeca-μ(2)-oxido-hexa­oxido-hexa­tungstate(VI)

The asymmetric unit of the title compound, [Co(2)(C(2)O(4))(C(10)H(8)N(2))(4)][W(6)O(19)], consists of one half of the complex [Co(2)(C(2)O(4))(C(10)H(8)N(2))(4)](2+) cation and one half of the Lindqvist-type [W(6)O(19)](2−) isopolyanion. Both constituents are completed by crystallographic inversion symmetry. In the dimeric cation, the Co(II) atom is surrounded in a distorted octa­hedral coordination by four N atoms from two chelating 2,2′-bipyridine ligands and by two O atoms from the chelating oxalate anion. The Lindqvist-type anion exhibits the characteristic W—O bond-length distribution, with the shortest bonds being the W—O(terminal) bonds and the longest being those to the central O atom.