Abstract
Cationic dinuclear cyclopentadienyl complexes containing tripod polytertiary phosphines as bridging ligands have been synthesized. The complexes [C 5H 5)Fe(CO)I—L—Fe(C 5H 5)]Y (L = tris(2-diphenylphosphinoethyl)amine, np 3; or tris(2-dipheynylphosphinoethyl)phosphine, pp 3; Y = PF 6 were obtained by reaction of (C 5H 5Fe(CO) 2I with the appropriate phosphorus ligands. The structure of the np 3 derivative was determined by X-ray diffraction. The crystals are monoclinic, space group P2 1/ n with cell dimensions a 16.393(5), b 22.317(6), c 15.345(5) Å, β 113.03(4)°, D c 1.55 g cm −3 for Z =4. The structure was solved by three dimensional Patterson and Fourier syntheses and refined by least-squares techniques to a final conventional R factor of 0.074. The structure consists of dinuclear [(C 5H 5)Fe(CO)I—np 3—Fe(c 5H 5] + cations and PF 6 − anions. The nitrogen and two phosphorus atoms of the np 3 ligand are bound to an cyclopentadienyliron group, while the other phosphorus atom of the ligand is bound to a cyclopentadienyliron-carbon monoxide-iodide moiety.
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