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Syntheses and crystal structures of butterfly M2Te2 complexes of molybdenum and tungsten with functionalized cyclopentadienyl ligands

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Reactions of singly-bonded dinuclear complexes [(? 5 -CH3O2CC5H4)2M2(CO)6] ( I , M?=?Mo; II , M?=?W) with the diarenylditelluride [4-CH3C6H4Te]2 in refluxing toluene for 4–6?h afforded dinuclear complexes 1 and 2 trans /ae-[(? 5 -RC5H4)2M2(CO)4(µ-ArTe)2] (Ar?=?4-CH3C6H4Te). Complexes 1 and 2 were also synthesized by reactions of triply-bonded dinuclear complexes [(? 5 -CH3O2CC5H4)2M2(CO)4] ( III , M?=?Mo; IV , M?=?W) with [4-CH3C6H4Te]2 in refluxing toluene for 1?h. Both complexes have been characterized by elemental analysis, 1 H NMR, 13 C NMR and IR spectroscopy and X-ray diffraction. Preliminary low-temperature NMR experiments on complexes 1 and 2 have revealed that in solution each complex goes through a rapid inversion of the butterfly four-membered ring M2Te2.
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Keywords: Crystal structure; Metal–metal bond; Molybdenum complex; Tungsten complex

Document Type: Research Article

Affiliations: School of Chemistry, Yangzhou University, Yangzhou 225002, P. R. China

Publication date: July 20, 2005

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