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In the polymeric title compound, [Cd(C4H2O4)(C19H12N4O)2]n, the CdII centre is eight-coordinated within an N4O4 donor set derived from two chelating 4-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)phenol ligands and two asymmetrically chelating carboxylate residues of bridging fumarate dianions. The linear chains are linked into a layer in the ac plane via O—H...Ocarboxylate hydrogen bonds. Layers are connected into double layers via N—H...Ocarboxylate hydrogen bonds and these stack along the b axis. C—H...π interactions are also present. Disorder in the ethylene portion of the fumarate was modelled over two positions, the major component having a site-occupancy factor of 0.677 (15).