SPECTROSCOPIC AND STRUCTURAL CHARACTERIZATION OF TRANS-HYDRIDO(1,1-DIMETHYLALLENE)BIS-(TRICYCLOHEXYLPHOSPHINE)PLATINUM(II) HEXAFLUOROPHOSPHATE

The platinum hydride cation, trans-[PtH(CH3OH)(P(C6H11)3)2]+ reacts with 1,1-dimethylallene at room temperature in dichloromethane to lose methanol and form an allene complex which has been characterized by 1H NMR spectroscopy and X-ray diffraction. Crystals grown from a mixture of hexane and o-dichlorobenzene are monoclinic, space group P21/n, with cell dimensions a 14.807(2), b 29.404(7), c 11.621(2) Å and β 90.75(1)°. There are four units of trans-[PtH(C5H8)(P(C6H11)3)2]PF6, C6H4Cl2 in the cell. Three dimensional X-ray data collected by diffractometer techniques have permitted full matrix least-squares refinement to a conventional agreement factor R = 0.052. The platinum atom has a square planar coordination geometry, with the planar allene ligand bonded at an angle of 89.2(6)° to the coordination plane, and PtC distances of 2.305(10) and 2.233(10) Å. © 1979.