A polymeric silver thiosaccarinate complex with a two-dimensional triply entangled mesh and argentophilic interactions.

Silver(I) complexes with sulfur-donor ligands have a broad range of pharma­cological applications. One of the most important factors for tuning the biological activity is the type of donor atom and the ease of ligand replacement. Silver thio­saccharinates display a wide range of structures from mono- to polynuclear complexes. We report the synthesis, crystal structure and vibrational spectroscopic analysis of a two-dimensional AgI–thio­saccharinate coordination polymer, namely poly[tris­(μ2-4,4′-bi­pyridine-κ2N:N′)bis­(μ3-1,1-dioxo-1,2-benz­iso­thia­zole-3-thiol­ato-κ3N:S3:S3)bis­(μ2-1,1-dioxo-1,2-benziso­thia­zole-3-thiol­ato-κ2S3:S3)tetra­silver(I)], [Ag2(C7H4NO2S2)2(C10H8N2)1.5]n, with 4,4′-bi­pyridine acting as a spacer. A relevant feature of the structure is the presence of an unusually short Ag⋯Ag separation of 2.8859 (10) A, well within the range of argentophilic inter­actions and confirmed as such by Raman analysis of the low-frequency spectrum. From a topological point of view, the structure presents inter­penetration in the form of a threefold entangled 2D→2D mesh (2D is two-dimensional).