Poly[(μ(3)-biphenyl-3,3'-dicarboxyl-ato)(1,10-phenanthroline)cadmium].

In the title compound, [Cd(C(14)H(8)O(4))(C(12)H(8)N(2))](n), the Cd(II) ion is seven-coordinated in a distorted penta-gonal-bipyramidal coordination geometry by five O atoms from bridging biphenyl-3,3'-dicarboylate (dpda) ligands and two N atoms from a 1,10-phenanthroline (1,10-phen) ligand. In the crystal, dinuclear units with a Cd⋯Cd separation of 3.8208 (7) Å are observed. Each of these dinuclear units is bridged via 3,3'-bpda in a chelating/chelating and bridging fashion, generating a zigzag chain along the c axis. Neighboring chains are further packed via weak π-π inter-actions between inter-chain parallel 1,10-phen rings [centroid-centroid distance = 3.5197 (9) Å] into a three-dimensional supra-molecular architecture.