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

Abstract The reaction between AgClO 4 , dppm and Na 2 S 2 O 3 ·5H 2 O affords the tetranuclear [Ag 4 (μ 3 -S 2 O 3 )(μ-S 2 O 3 )(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 Ag 4 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 [Ag 3 (μ 3 -Cl)(μ-S 2 O 3 )(μ-dppm) 3 ] cluster is obtained by a reaction of AgCl with dppm and Na 2 S 2 O 3 ·5H 2 O. The structure of the cluster comprises an Ag 3 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 Ag 3 plane and the chloride ion forms a triple bridge from the other side of the Ag 3 plane.