Metal-substituted ketenes: first C-13 and P-31 CP/MAS NMR determinations

Cross-polarization, combined with magic-angle spinning, has been employed t o obtain high-resolution solid-state C-13 and P-31 NMR spectra of a series of solid, peculiar ketenes, also known as eta (1)-ketenyl derivatives, bear ing as substituents a PPh3 moiety and a coordinatively unsaturated Pt(II) f ragment. Solid-state NMR data found for trans-[PtCl2(eta (2)-C2H4){eta (1)- C(PPh3)Co}], trans-[PtCl2{eta (1) -C(PPh3)CO}(2)], Ph3PC=C=O, trans-[PtCl2( eta (2)-C2H4) {eta (1)-CH(PPh3)COMe}], trans-[PtCl2{eta (1)-CH(PPh3)COMe}(2 )] and Ph3PCHCOMe, are compared with NMR values obtained in solution. The g eneral utility of the CP/MAS NMR technique in the study of unstable or inso luble complexes is discussed. (C) 2001 Elsevier Science B.V. All rights res erved.