Preparation of Mixed-metal Polynuclear Complexes by Stepwise Phosphine-bridging Reaction

The phosphine-bridged Pd(II)–Pt(II)–Pd(II) trinuclear and Rh(III)–Pd(II)–Pt(II)–Pd(II)–Rh(III) pentanuclear complexes with tris[2-(diphenylphosphino)ethyl]phosphine (pp3) ligands were successfully prepared by stepwise phosphine-bridging reaction of the terminal phosphino groups of the pp3 ligands on the Pd(II) cores.