Potassium (2,2′-bipyridine-κ(2) N,N′)bis­(carbonato-κ(2) O,O′)cobaltate(III) dihydrate

In the title compound, K[Co(CO(3))(2)(C(10)H(8)N(2))]·2H(2)O, the Co(III) atom is coordinated by two bipyridine N atoms and four O atoms from two bidentate chelating carbonate anions, and thus adopts a distorted octa­hedral N(2)O(4) environment. The [Co(bipy)(CO(3))(2)](−) (bipy is 2,2′-bipyridine) ­units are stacked along [100] via π–π stacking inter­actions, with inter­planar distances between the bipyridine rings of 3.36 (4) and 3.44 (6) Å, forming chains. Classical O—H⋯O hydrogen-bonding inter­actions link the chains, forming channels along (100) in which the K(+) ions reside and leading to a three-dimensional supra­molecular architecture.