Synthesis and Characterization of Imidocubanes with Exocube Ge<sup>IV</sup> and Sn<sup>IV</sup> Substituents:  [M(μ<sub>3</sub>-NGeMe<sub>3</sub>)]<sub>4</sub> (M = Sn, Ge, Pb); [Sn(μ<sub>3</sub>-NSnMe<sub>3</sub>)]<sub>4</sub>

The heteroleptic lithium amide, [(Me<sub>3</sub>Sn)(Me<sub>3</sub>Ge)NLi·(Et<sub>2</sub>O)]<sub>2</sub> (<b>2</b>), reacts with MCl<sub>2</sub> (M = Sn, Ge, Pb) to yield the corresponding cubane complexes [M(μ<sub>3</sub>-NGeMe<sub>3</sub>)]<sub>4</sub> [M = Sn (<b>3</b>), Ge (<b>4</b>), Pb (<b>5</b>)]. In an analogous reaction with SnCl<sub>2</sub>, the lithium stannylamide, [(Me<sub>3</sub>Sn)<sub>2</sub>NLi·(Et<sub>2</sub>O)]<sub>2</sub> (<b>1</b>), produces the mixed-valent Sn congener [Sn(μ<sub>3</sub>-NSnMe<sub>3</sub>)]<sub>4</sub> (<b>6</b>). All imidocubanes contain both di- and tetravalent group 14 metals that are bridged by N. These structures are comprised of M<sub>4</sub>N<sub>4</sub> (M = Sn, Pb, Ge) cores that possess varying distortion from perfect cube geometry. The Pb derivative (<b>5</b>) exhibits enhanced volatility and vapor-phase integrity.