Catena-[[(Nitrato-Kappa O)Silver(I)]-Mu-1,10-Phenanthroline-5,6-Dione-Kappa O-4,O ':N,N ']

In the title one-dimensional coordination polymer, [Ag(NO3)-(C12H6N2O2)](n), the Ag-I atom is pentacoordinated by two N atoms from a 1,10-phenanthroline-5,6-dione (phen-dione) ligand, one O atom from the nitrate anion and two O atoms from another phen-dione ligand. The coordination environment around silver is slightly distorted square-pyramidal. Interestingly, the Ag-O distances to the phen-dione ligand are different [Ag-O = 2.612 (6) and 2.470 (5) angstrom]. The one-dimensional chains run parallel to [101] and are further interconnected by weak hydrogen bonds (C-H center dot center dot center dot O) and pi-pi stacking interactions [centroid-centroid distances 3.950 (4) and 3.792 (4) angstrom], forming a three-dimensional supramolecular network.