{Sn<sub>9</sub>[Si(SiMe<sub>3</sub>)<sub>3</sub>]<sub>3</sub>}<sup>−</sup> and {Sn<sub>8</sub>Si[Si(SiMe<sub>3</sub>)<sub>3</sub>]<sub>3</sub>}<sup>−</sup>: Variations of the E<sub>9</sub> Cage of Metalloid Group 14 Clusters

The disproportionation reaction of the subvalent metastable halide SnBr proved to be a powerful synthetic method for the synthesis of metalloid cluster compounds of tin. Hence, the neutral metalloid cluster compound Sn<sub>10</sub>[Si­(SiMe<sub>3</sub>)<sub>3</sub>]<sub>6</sub> (<b>3</b>) was synthesized from the reaction of SnBr with LiSi­(SiMe<sub>3</sub>)<sub>3</sub>. In the course of the reaction anionic clusters might also be present, and we now present the first anionic cluster compound {Sn<sub>8</sub>E­[Si­(SiMe<sub>3</sub>)<sub>3</sub>]<sub>3</sub>}<sup>−</sup> (E = Si, Sn), where one position in the cluster core is occupied by a silicon or a tin atom, giving further insight into structural variations of E<sub>9</sub> cages in metalloid group 14 cluster compounds.