Bis(dialkylphosphino)methane complexes of palladium(II) and the molecular structure of [Pd2Cl3(µ-PriPCH2PPri2)(µ-Pri2PCH2PHPri)]·2CHCl3 containing an unusual phosphidophosphine bridging ligand

Abstract

The mononuclear chelate complexes [PdX₂(R₂PCH₂PR₂)](X = CF₃CO₂ or Cl; R = Me, Et, or Prⁱ) have been prepared and characterized spectroscopically. Reaction of [PdCl₂(PhCN)₂] with Prⁱ₂PCH₂PHPrⁱ gave a novel binuclear complex, [ Pd₂Cl₃(µ-PrⁱPCH₂PPrⁱ₂)(µ-Prⁱ₂PCH₂PHPrⁱ)], with the phosphidophosphine ligand in an unusual bridging mode. This complex was characterized by ¹H and ³¹P n.m.r. spectroscopy and by X-ray crystal-structure analysis of its trichloromethane solvate [triclinic, space group P, a= 8.744(2), b= 11.483(1), c= 20.108(4)Å, α= 103.49(1), β= 97.15(2), γ= 91.11(2)°, Z= 2, R= 0.035 for 5 918 symmetry-independent reflections with I 3σ(I)].