Syntheses and X-ray crystal structures of tetranuclear [Ag4(μ3-S2O3)(μ-S2O3)(μ-dppm)4] {dppm=bis(diphenylphosphino)methane} and trinuclear [Ag3(μ3-Cl)(μ-S2O3)(μ-dppm)3] clusters

The reaction between AgClO4, dppm and Na2S2O3·5H2O affords the tetranuclear [Ag4(μ3-S2O3)(μ-S2O3)(μ-dppm)4] cluster, in which the four Ag atoms form a square bridged by four dppm ligands and the two thiosulfate ligands are bound on both sides of the Ag4 plane. The S atom of one thiosulfate ion forms bonds with three Ag atoms, while the S atom of the other forms bonds with two Ag atoms. The trinuclear [Ag3(μ3-Cl)(μ-S2O3)(μ-dppm)3] cluster is obtained by a reaction of AgCl with dppm and Na2S2O3·5H2O. The structure of the cluster comprises an Ag3 triangle bridged by three dppm ligands. The S atom of the thiosulfate ion forms a double bridge at the edge of the triangle from one side of the Ag3 plane and the chloride ion forms a triple bridge from the other side of the Ag3 plane.