catena-Poly[[[bis-[μ-3-(4-carb-oxy-phen-oxy)propionato]-κO,O:O;κO:O,O-bis-[aqua-(N,N-dimethyl-formamide-κO)cadmium]]-μ-4,4'-bipyridine-κN:N'] dinitrate].

In the title coordination polymer, {Cd(2)(C(10)H(9)O(5))(2)(C(10)H(8)N(2))(2)(C(3)H(7)NO)(2)(H(2)O)(2)(2)}(n), the 3-(4-carb-oxy-phen-oxy)propionate monoanion O,O'-chelates to a Cd(II) cation through the aliphatic carboxyl-ate end. One of these O atoms is also connected to the metal cation from an inversion-related metal atom. The five O atoms bonded to the metal centre form a penta-gon, above and below which are located the N atoms of the 4,4'-bipyridine mol-ecules. The polycationic ribbon propagates along the b axis of the unit cell. The (aromatic) carboxyl end of the monoanion connects adjacent ribbons into a layer motif in the (102) plane. The nitrate ions are hydrogen bonded to the layer. The geometry of the Cd(II) atom is a trans-N(2)O(5)Cd penta-gonal bipyramid.