Journal of the American Chemical Society, Vol.131, No.50, 18026-18026, 2009
A Bimetallic Ru2Pt Complex Containing a Trigonal-Planar mu(3)-Carbido Ligand: Formation, Structure, and Reactivity Relevant to the Fischer-Tropsch Process
The bimetallic Ru2Pt complex [((CpRu)-Ru-star)(2)(mu(2)-NHPh)(mu(2)-H)(mu(3)-C)PtMe(PMe3)(2)][OTf] (3; Cp-star = eta(5)-C5Me5) containing a planar three-coordinate carbido ligand has been prepared in 93% yield by thermal isomerization of the bridging methylene precursor [((CpRu)-Ru-star)(2)Me(mu(3)-NPh)(mu(2)-CH2)Pt(PMe3)(2)][OTf] (2) via cleavage of the methylene C-H bonds. Exposure of the carbido complex 3 to carbon monoxide (1 atm) induced coupling of the carbido ligand with the nearby methyl and hydride ligands to produce the diruthenium ethylidene complex [((CpRu)-Ru-star)(2)(mu(2)-CHMe)(mu(2)-NHPh)(CO)(2)][OTf] (4) and the known triplatinum complex [Pt(CO)(PMe3)](3). The crystal structures of 2, 3, and 4 (BPh4 salt) are reported.