The Tris(trimethylsilyl)silylgallium Group as a Building Block in Gallium-Iron Clusters

Abstract

Trigonal bipyramidal clusters based on iron carbonyl and gallandiyl derivatives are described. Two types of cluster cores are shown right. a) The Ga3−xCOxFe2 core (Ga3Fe2 shown) is derived from Fe2(CO)9 by the replacement of all, two, or one of the bridging CO ligands with (Me3Si)3SiGa. b) The Ga2Fe3 core is understood as a closo-type cluster following Wade's rules, whereas for a) a classical description is valid. All clusters may be obtained from the reaction of [{Ga(Cl)Si(SiMe3)3}4] with the iron carbonylates Na2Fe(CO)4, Na2Fe2(CO)8 and Na2Fe3(CO)11.