catena-Poly[[(2,9-diethoxy-1,10-phenanthroline-κ2N,N′)cadmium(II)]-di-μ-dicyanamido-κ4N1:N5]

In the title polymer, [Cd(C2N3)(2)(C16H16N2O2)](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 pi-pi interactions between polymeric chains, characterized by a centroid-centroid distance of 3.7624 (2) angstrom between the phenanthroline rings of two neighbouring chains.