Crystal structure of a twisted-ribbon type double-stranded Ag coordination polymer: -poly[[silver(I)-μ-bis-(pyridin-3-ylmeth-yl)sulfane-κ:':] nitrate].

The asymmetric unit in the title compound, {[Ag(CHNS)]·NO} or {[Ag]·NO} , = bis-(pyridin-3-ylmeth-yl)sulfane, consists of an Ag cation bound to a pyridine N atom of an ligand and an NO anion that is disordered over two orientations in an 0.570 (17):0.430 (17) occupancy ratio. Each Ag cation is coordinated by two pyridine N atoms from adjacent ligands to form an infinite zigzag chain along [110]. In addition, each Ag ion binds to an S donor from a third ligand in an adjacent parallel chain, resulting in the formation of a twisted-ribbon type of double-stranded chain propagating along the [110] or [1-10] directions. The Ag atom is displaced out of the trigonal NS coordination plane by 0.371 (3) Å because of inter-actions between the Ag cation and O atoms of the disordered nitrate anions. Inter-molecular π-π stacking inter-actions [centroid-to-centroid distance = 3.824 (3) Å] occur between one pair of corresponding pyridine rings in the double-stranded chain. In the crystal, the double-stranded chains are alternately stacked along the axis with alternate stacks linked by inter-molecular π-π stacking inter-actions [centroid-to-centroid distance = 3.849 (3) Å], generating a three-dimensional supra-molecular architecture. Weak inter-molecular C-H⋯O hydrogen bonds between the polymer chains and the O atoms of the nitrate anions also occur.