Main > A1. CORP. INDEX. Hn-Hz > Humboldt Universitaet Berlin/P C2 > 2005. 09.26.2005. (Mole. Wire>Ge)

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Molecular wires have Ge in the middle

Transition-metal complexesin which two metal atoms are linked to one another through a conjugated digermanium chain have been synthesized by Alexander C. Filippou of Humboldt University of Berlin, in Germany, and coworkers (Angew. Chem. Int. Ed. 2005, 44, 5979). These digermylidyne complexes are reported to be the first group 14 analogs of carbon-based “molecular wires” in which sp-hybridized carbon chains span two transition-metal centers. Filippou s group previously reported the synthesis of molybdenum and tungsten complexes containing triple bonds to germanium, tin, and lead. To make the new complexes, the researchers relied on some of the same chemistry to synthesize molybdenum and tungsten phosphine complexes containing triple-bonded germanium cyclopentadienyl ligands. Heating these compounds in the solid state cleaves the cyclopentadienyl groups, allowing the resulting metal fragments to dimerize and form the digermylidynes shown, in which the phosphorus ligands are bis(diethylphos-phino)ethane groups.




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