The synthesis of palladium-gold and platinum-gold bimetallic complexes ased upon bis(diphenylarsino)methane: Crystal structure of trans-[Pd(μ-Ph2AsCH2AsPh2AuCl) 2Cl2]·xCH2Cl2

Article abstract of DOI:10.1016/0277-5387(95)00294-3

The reaction of trans-[M(η¹-Ph₂AsCH₂AsPh₂) ₂Cl₂] (M = Pd or Pt) with Au(tht)Cl (tht = tetrahydrothiophen) formed trans-[M(μ-Ph₂AsCH₂AsPh₂AuCl) ₂Cl₂], from which the corresponding bromides were made by reaction with LiBr. Oxidative addition of the appropriate dihalogen formed trans-[M(μ-Ph₂AsCH₂AsPh₂AuX ₃)₂X_n] (M = Pd, n = 2; M = Pt, n = 4). The structure of the complex trans-[Pd(μ-Ph₂As CH₂AsPh₂AuCl)₂Cl₂]·xCH ₂Cl₂ has been determined and shown to contain trans square planar palladium atoms [Pd-Cl 2.291 (av), Pd-As 2.416(2), 2.400(2) A]. Each bis(diphenylarsino)methane ligand coordinates to palladium and gold [As-Au 2.331(2), 2.340(2) A], but there are no significant Pd . . . Au interactions. The ligand Me₂AsCH₂AsMe₂ formed only insoluble, probably polymeric. 1 : 1 complexes [{MCl₂(Me₂AsCH₂AsMe₂)}_n], whilst reaction of [PdCl₂(Ph₂SbCH₂SbPh₂)₂] with [Au(tht)Cl] produced [PdCl₂ (Ph₂SbCH₂SbPh₂)]₂ and [ClAu(Ph₂SbCH₂SbPh₂)AuCl].