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Hexacarbonyl Complexes of Dirhenium(I) containing E2Ph4 (E = P, As, or Sb) Ligands; X-Ray Crystal Structure of

DOI: 10.1039/DT9840001945

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Journal of the Chemical Society, Dalton Transactions p. 1945 - 1950 (1984)

Update date:2022-07-29

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Authors:

Bernal, IvanBernal, Ivan

Korp, James D.Korp, James D.

Calderazzo, FaustoCalderazzo, Fausto

Poli, RinaldoPoli, Rinaldo

Vitali, DarioVitali, Dario

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Article abstract of DOI:10.1039/DT9840001945

The E2Ph4 complexes of rhenium(I), (X = Br, E = As or Sb; X = I, E = P, As, or Sb), have been prepared by the reactions of (thf = tetrahydrofuran) or with the appropriate E2Ph4.The crystal and molecular structure of one of the compounds, namely , has been solved by X-ray diffraction methods.The crystals are monoclinic, space group P21/n, with a = 16.585(8), b = 22.036(13), c = 19.764(19) Angstroem, β = 109.34 (6) deg, and Z = 8.Data collection yielded 2 197 observed reflections, R = 0.040.The molecule consists of two pseudo-octahedral rhenium (I) centres joined by bromide and Sb2Ph4 bridges.Average distances include Re-Br 2.663(4), Sb...Br 3.640(3), Re...Re 3.970(2), and Sb-Sb 2.826(4) Angstroem.The rhenium-P2Ph4 complex undergoes nucleophilic attack by PPh2(1-) to form an anionic rhenium(I) carbonyl species.The small angle of folding along the Br...Br vector produces the appearance of the number of i.r. carbonyl stretches expected for the local C2v symmetry of the Re2(CO)6 core, presumably due to a better coupling of the Re(CO)3 moieties.Chemical evidence and mass spectral data indicate that the stability of the rhenium(I) complexes decreases with increasing atomic weight of the Group 5 donor atom.

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Product name:Re(CO)3(P(C6H5)2CH3)3(1+)*I(1-)=Re(CO)3(P(C6H5)2CH3)3I

Cas No:94081-64-8

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