UNSYMMETRICAL HYDRIDE-BRIDGED A-FRAME COMPLEXES OF PLATINUM AND PALLADIUM

The symmetrical hydride-bridged complexes [Pt2R2(mu-H)(mu-dppm)2]PF6 ( R = Me, Et, Ph) and [Pd2R2(mu-H)(mu-dppm)2]PF6 (R = Me, Ph) have been prepared by NaBH4 reduction of the corresponding chloride-bridged comp lexes in CH2Cl2 solution. The unsymmetrical analogues [RPt(mu-H)(mu-dp pm)2MR']PF6 (R = Me, Et, Ph; MR' = PtMe, PtEt, PtPh, PdMe, PdPh) have been generated by consecutive addition to [PtR(dppm-P,P)(dppm-P)]Cl of [PtClR(cod)] or [Pd2(mu-Cl)2R2(AsPh3)2], NaBH4, and NH4PF6. The produ cts have been characterized by microanalysis and by H-1 and P-31{H-1} NMR spectroscopy.