Crystal and molecular structure of [{Ag[S2P(OEt)2]·PPh3}2]

Abstract

The reaction of [Ag{S₂P(OEt)₂}] with triphenylphosphine yields [{Ag[S₂P(OEt)₂·PPh₃}₂](1). The crystal structure of compound (1) has been determined. The crystals are monoclinic, space group P2₁/c, a= 14.965(13), b= 9.753(8), c= 18.438(12)Å, β= 119.0(1)°, and Z= 2. 2 401 Independent reflections above background were measured on a diffractometer and the structure was refined to R= 0.056. The structure contains the centrosymmetric species [{Ag[S₂P(OEt)₂]·PPh₃}₂], in which the two dithiophosphate ligands bridge the two metal centres in a unique fashion. The bonding mode of the two sulphur atoms of the dithiophosphate ligand is very different; while S(1) bridges two silver atoms [2.502(2) and 2.821(2)Å], S(2) is only bonded to one [2.810(2)Å]. The silver atoms are also bonded to triphenylphosphine [Ag–P 2.404(2)Å] to complete a distorted four-co-ordinate geometry.