In the title polymeric compound, [Cd(C(9)H(12)O(4))(C(10)H(8)N(2))](n), the Cd(II) atom is located on a twofold rotation axis and is coordinated by two 4,4'-bipyridine ligands and two 2,2-dimethyl-cyclo-pentane-1,3-dicarboxyl-ate ions. The carboxyl-ate ion and the N-heterocycle both function as bridges to link adjacent Cd(II) atoms to result in the formation of a layer structure parallel to (010). The mid-point of the central C-C bond of the 4,4'-bipyridine ligand is located on an inversion center. In the crystal, the carboxyl-ate ion is disordered over a twofold rotation axis in respect of its methyl group and the cyclo-pentane ring.
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