STUDIES ON METAL-ACETYLENE COMPLEXES X. SPECTROSCOPIC STUDIES OF HEXAFLUOROBUT-2-YNE COMPLEXES, AND THE X-RAY STRUCTURE OF AN ACETYLENE COMPOUND CONTAINING A CHIRAL, CHELATING DIPHOSPHINE

Article abstract of DOI:10.1016/S0022-328X(00)90113-X

The acetylene complex (-)-(N,N-bis(diphenylphosphino)-1-phenethylamine)(hexafluorobut-2-yne)platinum(0) has been prepared, and its structure determined by X-ray analysis.Crystals are monoclinic, space group P2₁, with a cell of dimensions a = 11.177(2), b = 15.690(3), c = 19.655(4) Angstroem and β = 94.46(1) deg.Intensity data collected on an automated four-circle diffractometer was used for full-matrix least-squares refinement on F, which converged at R = 0.059, 5851 observations.There are two molecules in the asymmetric unit.The coordination at the Pt atoms is es sentially planar, and the C<*>C bond distances are 1.26(2) and 1.25(2) Angstroem.The deviations from linearity of the alkyne ligand upon coordination are 38(2) deg and 46(2) deg in one molecule, while values of 40(2) deg and 39(2) deg are found in the other.IR, 19F NMR and 31P NMR spectra are reported and discussed for this species and for the series of hexafluorobut-2-yne complexes of general formula ML2-(acetylene) which we have studied by X-ray techniques.