Polynuclear Homo- or Heterometallic Palladium(II)−Platinum(II) Pentafluorophenyl Complexes Containing Bridging Diphenylphosphido Ligands. 8. Syntheses and Reactivity of the Tetranuclear [Pt4(μ2-PPh2)3{μ3-PPh(1,2-η2-Ph)-κ3P}(C6F5)4] Cluster

The reaction of [NBu 4 ] 2 [{(C 6 F 5 ) 2 Pt(μ-PPh 2 ) 2 Pt(μ-Cl)} 2 ] with AgClO 4 in CH 2 Cl 2 (1:2 mol ratio) gives the neutral tetranuclear compound [Pt 4 (μ-PPh 2 ) 3 {μ 3 -PPh(1,2-η 2 -Ph)-κ 3 P )}(C 6 F 5 ) 4 ] ( 5 ), a 58-electron cluster that displays three Pt−Pt bonds and a 1,2-η 2 -Ph (of the PPh 2 ligand) Pt interaction. This complex reacts with bipy or phen (L−L), giving the tetranuclear clusters [Pt 4 (μ-PPh 2 ) 4 (C 6 F 5 ) 4 (L−L)] (L−L = bipy 6, phen 7 ), while its reaction with CO in CH 2 Cl 2 renders [{Pt 2 (μ-PPh 2 ) 2 (C 6 F 5 ) 2 (CO)} 2 ] ( 8 ). The molecular structures of complexes 5 and 6 have been established by X-ray crystallography, and the structure of 8 is inferred by 31 P NMR spectroscopy.