Bis(μ-pyridine-2,5-dicarboxyl­ato)-κ(3) N,O (2):O (5);κ(3) O (5):N,O (2)-bis­[aqua­(2,2′-bipyridine-κ(2) N,N′)cobalt(II)] dihydrate

In the centrosymmetric title compound, [Co(2)(C(7)H(3)NO(4))(2)(C(10)H(8)N(2))(2)(H(2)O)(2)]·2H(2)O, the two Co(II) cations are bridged by pairs of pyridine-2,5-dicarboxyl­ate anions across an inversion center. Besides two pyridine-2,5-dicarboxyl­ate anions, one bidentate 2,2′-bipyridine and one water mol­ecule coordinate to the Co cation, completing a distorted octa­hedral coordination geometry. Within the dinuclear mol­ecule, π–π stacking occurs between parallel pyridine rings with centroid–centroid distances of 3.802 (2) Å. The crystal structure contains extensive O—H⋯O and weak C—H⋯O hydrogen bonds and C—H⋯π inter­actions.