catena-Poly­[[[tetra­aqua­cobalt(II)]-μ-4,4′-bi­pyridine-κ2 N: N′] 3-carboxyl­ato­phenoxy­acetate monohydrate].

The asymmetric unit of the title one-dimensional coordination polymer, {[Co(C10H8N2)(H2O)4](C9H6O5)·H2O} n, comprises two half-cations, [Co(4,4′-bipy)(H2O)4]22+ (4,4′-bipy is 4,4′-bi­pyridine), one 3-carboxyl­ato­phenoxy­acetate (3-CPOA2−) dianion and one non-coordinated water mol­ecule. The CoII ions, both of which are located on inversion centres, have approximately octahedral geometries, involving two N atoms of the centrosymmetric 4,4′-bipy ligand and four water mol­ecules. Adjacent CoII atoms are linked by 4,4′-bipy ligands into a chain, the shortest Co⋯Co separation within the polymeric chain being 11.456 (2) Å. The chains are further linked by hydrogen-bonding and π–π stacking interactions, generating a three-dimensional network. [ABSTRACT FROM AUTHOR]