Journal of the Chemical Society, Dalton Transactions p. 162 - 170 (1981)
Update date:2022-08-02
Topics:
Farrugia, Louis J.
Howard, Judith A. K.
Mitrprachachon, Pachanee
Stone, F. Gordon A.
Woodward, Peter
The compounds a unit cell with lattice parameters a=14.427(7), b=12.793(5), c=14.151(6) Angtstroem, α=92.33(3), β=120.87(3), and γ=91.06(4)o.The structure has been refined to R 0.041 (R' 0.044) for 5 794 independent reflections (2.9 < or = 2θ < or = 60 deg, Mo-Ka X-radiation) collected at 200 K.The four metal atoms adopt a butterfly arrangement in contrast to the tetrahedral cluster structure of the 58-electron precursors a mixture, from which five polynuclear metal complexes were isolated and studied by IR and NMR spectroscopy.None of these products contained the Os3Pt cluster of the precursor.One of the complexes was characterised as a unit cell of dimensions a=11.143(8), b=17.458(12), c=23.443(15) Angstroem, and β= 113.82(5) deg.The structure has been refined to R 0.031 (R' 0.033) for 4 438 independent reflections (2.9 < or = 2θ < or = 55 deg, Mo-Kα X-radiation) collected at 200 K.The metal atoms form anisoceles triangle a face-bonding but-2-yne molecule whose orientation with respect to the triangle is μ3(η2-II).The osmium atom carries three terminal CO ligands, and each platinum a CO and PPh3 group such that there is a cisoid arragement OCPtPtCO; the Pt-Pt separation of 3.033(2) Angstroem, however, suggests that there may be little direct metal-metal interaction.
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