Bimetallic systems. Part 3. Complexes containing the ligand bis(diphenylphosphino)methane bridging from the platinacycle PtCH2CH2CH2CH2 to another metal

The metallacycle [graphic omitted]H2)(dppm-PP′)](5)(dppm = Ph2PCH2PPh2) is made from [PtCl2(dppm-PP′)] and Li(CH2)4Li in diethyl ether. Complex (5) rapidly reacts with dppm to give [[graphic omitted]H2)(dppm-P)2](6) which contains monodentate dppm ligands and is remarkably stable with respect to dissociation. It is shown that (6) is a convenient starting material for making bimetallic species. Thus treatment of (6) with [{Agl(PPh3)}4] gives the neutral complex [([graphic omitted]t(µ-dppm)2Agl]; treatment with Ag[PF6] or [AuCl(PPh3)] gives the salts [([graphic omitted]t(µ-dppm)2M]+X–(M = Ag, X = PF6; M = Au, X = Cl) and treatment with [MCl(CH3)(cod)](cod = cyclo-octa-1,5-diene) gives the dative-bonded species [([graphic omitted]t(µ-dppm)2M(CH3)]Cl (M = Pt or Pd). Microanalytical data, solution conductivity data, and 1H-{31P}, 31P-{1H}, and 195Pt-{1H} n.m.r. data are given and discussed.