2,2'-Bibenzimidazolate Anions as Bridging Ligands in Cationic Heteronuclear Gold(I)-Rhodium(I) Complexes. Crystal Structure of *CHCl3

Article abstract of DOI:10.1039/DT9830000323

Heterobinuclear complexes of the general formula have been prepared by treatment of with Ag and .Binuclear 2,2'-bibenzimidazole gold(I) (bbzim = dianion of 2,2'-bibenzimidazolate) complexes of the type react with x> to give new heterotrinuclear complexes of general formula .Bubbling of carbon monoxide through solutions of the complexes generally leaqds to the formation of the corresponding dicarbonylrhodium species.Nonetheless, <(Ph3P)Au(μ-Hbbzim)Rh(cod)> reacts with carbon monoxide to yield <(Ph3P)2Au2(μ-bbzim)Rh(CO)2> and .Other related monocarbonyls are also described.The structure of the chloroform solvate of the compound <(Ph3P)2Au2(μ-bbzim)Rh(cod)> has been determined by X-ray methods; it crystallizes in the triclinic space group P1 with a = 20.972(14), b = 11.324(9), c = 14.425(10) Angstroem, α = 64.00(7), β = 85.84(6), γ = 91.18(6) deg, and Z = 2.The structure has been solved by Patterson and Fourier methods and refined by full-matrix least squares to R = 0.078 for 2 460 observed reflections.The bbzim dianion co-ordinates to the metal atoms in an unsymmetrical tetradentate manner: it chelates to one Rh atom through two N atoms from both imidazole rings and is bonded to two Au atoms through the other two N atoms of the imidazole rings.The co-ordination at the Rh atom also involves a cod molecule interacting through the two double bonds.The co-ordination at the Au atoms is completed by a PPh3 ligand and is essentially linear.A short intramolecular Au...Au contact <3.134(4) Angstroem> is observrd in the complex.

Full text of DOI:10.1039/DT9830000323

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