POLYNUCLEAR HOMO- OR HETEROMETALLIC PALLADIUM(II)-PLATINUM(II) PENTAFLUOROPHENYL COMPLEXES CONTAINING BRIDGING DIPHENYLPHOSPHIDO LIGANDS. 6. SYNTHESES AND MOLECULAR STRUCTURE OF PT4(MU 2-PPH2)4(C6F5)4(CO)2.2CH2CL2 AND PT2PD2( MU 2-PPH2)2(MU 3-PPH(1,2-ETA 2-PH)-KAPPA 3P)-(C6F5)3(CO)(PPH2C6F5).CHCL3.C