Tetrakis(tetrasulphur tetranitrogen dioxide)silver hexafluoroarsenate(V)

A complex of silver(I) containing tetrasulphur tetranitrogen dioxide ligands has been prepared. The crystals of [Ag(S4N4O2)4]+[AsF6]– are triclinic, space group P, with unit-cell dimensions a= 1 142.6(6), b= 1 194.9(5), c= 1 254.8(6) pm, α= 66.44(4), β= 96.71(4), γ= 91.30(4)°, and Z= 2, final R= 0.039 for 4 968 unique diffractometer data with F > 3σ(F). The Ag atom lies 53 pm below a square of four nitrogen atoms (mean Ag–N 256 pm). Bisdisphenoidal (triangulated dodecahedral) co-ordination of Ag is completed by two intramolecular Ag–O contacts (mean 307 pm), and intermolecular Ag–N and Ag–O interactions (both 273 pm). These intermolecular interactions give rise to a centrosymmetric cationic dimer. The S4N4O2 ligands are approximately planar except for the SO2 units; only nitrogen and oxygen atoms attached to SVI interact with Ag, thereby causing the least disruption of delocalised bonding in the rest of the ring.