Synthesis, Dynamic Behavior, and Reactivity of New Unsaturated Heterotrinuclear 46 Valence Electron Complexes † † Polynuclear Homo- or Heterometallic Palladium(II)−Platinum(II) Pentafluorophenyl Complexes Containing Bridging Diphenylphosphido Ligands. 27. For part 26, see ref 1.