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Transition Metal-Carbon Bonds. Part 48. Allene Complexes from Halogeno-bridged Platinum(II) Complexes: Crystal structures of cis-n3)(C3H4)> and cis-

DOI: 10.1039/DT9810000121

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 121 - 125 (1981)

Update date:2022-08-04

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Authors:

Briggs, John R.Briggs, John R.

Crocker, ChristopherCrocker, Christopher

McDonald, Walter S.McDonald, Walter S.

Shaw, Bernard L.Shaw, Bernard L.

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Article abstract of DOI:10.1039/DT9810000121

A 31p n.m.r. study of the system -allene shows that at low temperatures (e.g. 213 K) trans- forms rapidly and reversibly.At 20 Deg C ( PR3 =P(n-Pr)3, PMe2Et, or PMe2Ph) react with allene to give colourless complexes cis-, the crystal structures of the P(n-Pr)3 and PMe2Ph complexes were determined by X-ray diffraction.Crystal data are for a =15.461(2), b = 11.437(2), c = 9.606(2) Angstroem, space group Pna21,with Z =4 and for a = 8.398(2), b = 10.209(3), c= 15.677(4) Angstroem, space group P212121, and Z = 4.Final R factors are R = 0.026 and 0.029 respectively.These cis complexes dissociate very slowly in solution, in contrast with cis-, which was previously reported to be unstable.Treatment of cis- with gives what is probably the μ-allene complex cis,cis-<(PhMe2P)Cl2Pt(C3H4)PtCl2(PMe2Ph)> which was too insoluble to characterize fully.Treatment of 2 (X = Cl, Br, or I) with an exess of allene gives the salts .Treatment of with 2 (X = Cl or Br) gave the μ-allene complexes 2.The N(n-Pr)4 salt was also made.Proton, 13C, and 31P n.m.r.data and i.r. data are given and discussed.

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