Crystal structure of a twisted-ribbon type double-stranded AgI coordination polymer: catena-polysilver(I)-μ3-bis­(pyridin-3-ylmeth­yl)sulfane-κ3N:N′:S nitrate

摘要

The asymmetric unit in the title compound, {[Ag(C12H12N2S)]·NO3}n or {[AgL]·NO3}n, L = bis­(pyridin-3-ylmeth­yl)sulfane, consists of an Ag^I cation bound to a pyridine N atom of an L ligand and an NO3 ⁻ anion that is disordered over two orientations in an 0.570 (17):0.430 (17) occupancy ratio. Each Ag^I cation is coordinated by two pyridine N atoms from adjacent L ligands to form an infinite zigzag chain along [110]. In addition, each Ag^I ion binds to an S donor from a third L 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^I atom is displaced out of the trigonal N2S coordination plane by 0.371 (3) Å because of inter­actions between the Ag^I cation and O atoms of the disordered nitrate anions. Inter­molecular π–π stacking inter­actions [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 c axis with alternate stacks linked by inter­molecular π–π stacking inter­actions [centroid-to-centroid distance = 3.849 (3) Å], generating a three-dimensional supra­molecular architecture. Weak inter­molecular C—H⋯O hydrogen bonds between the polymer chains and the O atoms of the nitrate anions also occur.