Abstract
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 [PdCl&sub2;(cod)] (cod = cycloocta-1,5-diene) and [Pd(μ-Cl)(LNC)]&sub2; (LNC = [2-(dimethylamino-κN)methyl]phenyl-κC¹) produced bis(phosphine) complex trans-[PdCl&sub2;(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)}&sub2;] (5), respectively. In reactions with the Au(I) precursors [AuCl(tht)] and [Au(tht)&sub2;][SbF₆] (tht = tetrahydrothiophene), ligand 1 gave rise to tetranuclear Au&sub2;Fe&sub2; complex [(μ(P,P')-1)(AuCl)&sub2;] (6) and to symmetrical macrocyclic tetramer [Au&sub4;(μ(P,P')-1)&sub4;][SbF₆]&sub4; (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).