Reactions of diferrocenyl dichalcogenides with [W(CO)5(THF)]: X-ray crystal structures of Fc2Te2 and [W2(μ-SeFc)2(CO)8] (Fc = [Fe(η5-C5H5)(η5-C5H4)])

Treatment of [W(CO)5THF] with diferrocenyl diselenide, Fc2Se2, yielded the novel metal–metal bonded tungsten(I) complex, [W2(μ-SeFc)2(CO)8] (1: Fc = ferrocenyl, [Fe(η5-C5H5)(η5-C5H4)]), which was characterised by NMR and IR spectroscopy, mass spectrometry, and X-ray crystallography. The corresponding tellurium derivative could not be prepared by an analogous route. The X-ray crystal structure of Fc2Te2 has also been determined.