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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.

Potassium (2,2′-bipyridine-κ2N,N′)bis(carbonato-κ2O,O′)cobaltate(III) dihydrate

Potassium (2,2′-bipyridine-κ²N,N′)bis(carbonato-κ²O,O′)cobaltate(III) dihydrate