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Reactions of Bis(ethylene)(tricyclohexyl- and triphenyl-phosphine)-platinum with Quinones. Crystal Structure of Ethylene(2-3-η-2,3,5,6-tetramethylbenzo-1,4-quinone)(tricyclohexylphosphine)platinum

DOI: 10.1039/DT9810000284

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 284 - 291 (1981)

Update date:2022-09-26

Topics:

Authors:

Chetcuti, Michael J.Chetcuti, Michael J.

Herbert, Judith A.Herbert, Judith A.

Howard, Judith A. K.Howard, Judith A. K.

Pfeffer, MichelPfeffer, Michel

Spencer, John L.Spencer, John L.

et al.et al.

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Article abstract of DOI:10.1039/DT9810000284

A series of complexes 2-quinone)(C2H4)<3> has been prepared by treating > with benzo-1,4-quinones. (13)C NMR studies on the compounds containing the ligands 2,3-dimethyl-, 2,5-dimethyl-, 2,5-diphenyl-benzo-1,4-quinone, and naphto-1,4-quinone revelaed that although the C2H4 group is undergoing rapid rotation, the η2-bonded quinone is rigid on the n.m.r. time scale.In contrast, in the derivatives from 2,6-dimethyl-, 2,6-di-t-butyl-, 2,6-dimethoxy-, and 2,3,5,6-tetramethyl-benzo-1,4-quinone, the quinone ligands are also undergoing dynamic behaviour.The η2 ground-state structure was established by an X-ray diffraction study on the compound 2-C6Me4O2)(C2H4)>.Crystals are triclinic, space group P1, Z = 2, in a unit cell with lattice parameters a = 9.818(3), b = 10.489(3), c = 14.486(3) Angstroem, α = 97.27(2), β = 97.93(2), and γ = 91.33(3) deg.The structure has been refined to R 0.027 (R'0.033) for 6 467 independent reflections collected at 200 K for 2.9 < or = 2θ < or = 55 deg (Mo-Kα X-radiation).The results establish that the 2,3,5,6-tetramethylbenzo-1,4-quinone ligand is attached to platinum by two carbon atoms of one C(Me)=C(Me) group, and the metal is in a trigonal planar environment with the midpoint of this group, the phosphorous atom, and the midpoint of the C-C bond of the ethylene ligand, with all these co-ordinated atoms lying within 0.1 Angstroem of the co-ordination plane.

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Product name:{Pt(C6H4O2)(C2H4)(P(C6H11)3)}

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