Aqua-[2,2'-(propane-1,3-di-yl)bis-(5-car-boxy-1H-imidazole-4-carboxyl-ato)-κ(4)N(3),O(4):N(3'),O(4')](pyridine-κN)cobalt(II)-4,4'-bipyridine (1/1).

In the title compound, [Co(C(13)H(10)N(4)O(8))(C(5)H(5)N)(H(2)O)]·C(10)H(8)N(2), the asymmetric unit comprises half a Co(II) complex located on a mirror plane and half a cocrystallized mol-ecule of 4,4'-bipyridine located on an inversion center. The Co(II) ion is six coordinate, with distorted octa-hedral geometry, ligated by two N atoms and two O atoms from a 2,2'-(propane-1,3-di-yl)bis-(5-carboxy-1H-imidazole-4-carboxyl-ate) dianion, one N atom from a pyridine mol-ecule and one coordinating water mol-ecule. The Co-O bond lengths range from 2.076 (2) to 2.1441 (15) Å, while the Co-N bond lengths are 2.138 (3) and 2.1515 (17) Å. A two-dimensional network of N-H⋯O and O-H⋯N hydrogen bonds stabilizes the crystal packing. There are π-π inter-actions between the bipyridine and imidazole rings [centroid-centroid distance = 3.7694 (4) Å]. The propane-1,3-diyl group is disordered over two conformations, with refined occupancies of 0.755 (8) and 0.245 (8).