Synthesis, Structure, and Reactivity of Mixed-Metal Clusters Bearing η1-Acetylide Groups, (η5-C5H5)MFe2(μ3-E)2(CO)6(η1-CCPh) (M = Mo or W and E = Se or Te)

Abstract

Reaction of Fe3(CO)9(μ3-E)2 (E = Se, Te) with (η5-C5H5)M(CO)3(C⋮CPh) (M = Mo, W), in the presence of trimethylamine-N-oxide (TMNO), in acetonitrile solvent at 60 °C yields the novel mixed-metal clusters (η5-C5H5)MFe2(μ3-E)2(CO)6(η1-CCPh) (1, E = Se, M = Mo; 2, E = Se, M = W; 3, E = Te, M = Mo; 4, E = Te, M = W) bearing η1-acetylide groups. The reaction of 1 or 3 with dicobalt octacarbonyl at room temperature gives the mixed-metal clusters (η5-C5H5)MoFe2Co2(μ3-E)2(CO)9(μ-CCPh) (5, 6). Structures of 1 and 6 have been established crystallographically.