Reaction of the binulear ruthenium-platinum allenyl complexes (PPh3)(2)Pt(mu-eta(1):eta(2)(alpha,beta)-C(R)=C=CH2)Ru(CO)Cp (R = H, Ph) with (PPh3)AuO3SCF3. The synthesis and characterization of a trimetallic 1 : 1 adduct of the reactants

The reaction of the heterobinuclear metal mu-allenyl complexes (PPh3)(2)Pt( mu-eta(1):eta(alpha,beta)(2)-C(R)=C=CH2)Ru(CO)Cp (R=H(1), Ph (2)) with (PPh 3)AuO3SCF3 in THF at -78 degrees C to room temperature affords the trimetal lic products [(PPh3)(2)Pt(mu(2)-CO)RuCpAu(PPh3)(mu(3)-eta(1):eta(3):eta(1)- CH2CCR)]+O3SCF3- (R=H (3), Ph (4)) in 46 and 55% isolated yield, respective ly. The products were characterized by a combination of elemental analysis, FAB mass spectrometry, and IR and H-1, C-13, and P-31 NMR spectroscopy. Th e structure of 4 was elucidated by a single-crystal X-ray analysis. The cry stal contains discrete trimetallic RuPtAu cations and CF3SO3- anions. In th e cation, a Pt-Ru bond of 2.7171(6) Angstrom is supported by a semibridging CO and a CH2CCPh allyl, which is eta(3)-bonded to Ru, and eta(1)-bonded to each of Pt (through the CPh carbon) and Au (through the central carbon). T he Ph3P-Au-C fragment is close to linear (175.0(2)degrees), and the coordin ation environment around Pt is distorted square planar. Complex 3 appears t o have the same type of structure as 4 from spectroscopic data.