Synthesis and Coordination Behavior of a Flexible Bis(phosphinoferrocene) Ligand

Molecules. 2018 Aug 16;23(8):2054. doi: 10.3390/molecules23082054.


A symmetrical flexible bis(phosphinoferrocene) derivative, viz. bis[1'-(diphenylphosphino)ferrocenyl]methane (1), was prepared and studied as a ligand in Pd(II) and Au(I) complexes. The reactions of 1 with [PdCl₂(cod)] (cod = cycloocta-1,5-diene) and [Pd(μ-Cl)(LNC)]₂ (LNC = [2-(dimethylamino-κN)methyl]phenyl-κC¹) produced bis(phosphine) complex trans-[PdCl₂(1-κ²P,P')] (4), wherein the ligand spans trans positions in the square-planar coordination sphere of Pd(II) and the tetranuclear, P,P-bridged complex [(μ(P,P')-1){PdCl(LNC)}₂] (5), respectively. In reactions with the Au(I) precursors [AuCl(tht)] and [Au(tht)₂][SbF₆] (tht = tetrahydrothiophene), ligand 1 gave rise to tetranuclear Au₂Fe₂ complex [(μ(P,P')-1)(AuCl)₂] (6) and to symmetrical macrocyclic tetramer [Au₄(μ(P,P')-1)₄][SbF₆]₄ (7). All compounds were characterized by spectroscopic methods. In addition, the structures of compound 1, its synthetic precursor bis[1'-(diphenylphosphino)ferrocenyl]methanone (3), and all aforementioned Pd(II) and Au(I) complexes were determined by single-crystal X-ray diffraction analysis (some in solvated form).

Keywords: ferrocene ligands; gold; palladium; phosphines; structure elucidation.

MeSH terms

  • Coordination Complexes / chemical synthesis*
  • Crystallography, X-Ray
  • Gold / chemistry
  • Iron / chemistry
  • Ligands
  • Metallocenes / chemistry*
  • Molecular Structure
  • Palladium / chemistry
  • Phosphines / chemistry*


  • Coordination Complexes
  • Ligands
  • Metallocenes
  • Phosphines
  • Palladium
  • Gold
  • Iron