Na_6[Ge_(10){Fe(CO)_4}_8].18 THF: A Centaur Polyhedron of Germanium Atoms

摘要

Metalloid cluster compounds of germanium of the general formula [GenRm] (n>m)[1] contain ligand-bound germanium atoms as well as naked germanium atoms that form exclusively GeGe bonds.[2] Various synthetic strategies are known for incorporating naked germanium atoms into metalloid germanium cluster compounds: the reductive elimination of a leaving group XY can provide naked germanium atoms if the X- and Y-bound germanium atoms are further connected only to other germanium atoms in the precursor. This synthetic route was proposed by Sekiguchi et al. for the preparation of the cationic cluster compound [Ge10(SitBu3)6I]+ (1).[3] Another synthetic strategy uses the reductive coupling reaction of a substituted germanium(II) halide RGeCl with an adequate reducing agent such as C8K in the presence of a germanium(II) halide (e.g. GeCl2dioxane). Thus, Power and co-workers synthesized the metalloid cluster compounds [Ge6Ar2] (2, Ar=C6H3-2,6-Dipp2; Dipp=C6H3-2,6-iPr2)[4] and [Ge5R4] (3, R=CH(SiMe3)2).