catena-Poly[[(2,9-dieth­oxy-1,10-phen­anthroline-κ(2) N,N′)cadmium(II)]-di-μ-dicyan­amido-κ(4) N (1):N (5)]

In the title polymer, [Cd(C(2)N(3))(2)(C(16)H(16)N(2)O(2))](n), the Cd(II) ion is coordinated by two N atoms from one 2,9-dieth­oxy-1,10-phenanthroline mol­ecule and four N atoms from four symmetry-related dicyanamide ions in a distorted octa­hedral geometry. In the 2,9-dieth­oxy-1,10-phenanthroline ligand, the O and C atoms of the eth­oxy groups are located almost in the plane defined by the phenanthroline ring system. Two dicyanamide ions bridge two Cd(II) ions, which are located on a twofold axis, forming a one-dimensional zigzag chain along the [001] direction. The 2,9-dieth­oxy-1,10-phenanthroline mol­ecules act as bidentate terminal ligands. There are π–π inter­actions between polymeric chains, characterized by a centroid–centroid distance of 3.7624 (2) Å between the phenanthroline rings of two neighbouring chains.