Unusual Metal-Metal Bonding in a Dinuclear Pt-Au Complex: Snapshot of a Transmetalation Process

摘要

The dinuclear Pt-Au complex [(CNC)(PPh3)PtAu-(PPh3)](ClO4) (2) (CNC = 2,6-diphenylpyridinate) was prepared. Its crystal structure shows a rare metal-metal bonding situation, with very short Pt-Au and Au-C-ipso(CNC) distances and dissimilar Pt-C-ipso(CNC) bonds. Multinuclear NMR spectra of 2 show the persistence of the Pt-Au bond in solution and the occurrence of unusual fluxional behavior involving the [Pt-II] and [Au-I] metal fragments. The [Pt-II]center dot center dot center dot[Au-I] interaction has been thoroughly studied by means of DFT calculations. The observed bonding situation in 2 can be regarded as a model for an intermediate in a transmetalation process.