Eichler JF, Just O, Rees WS. Synthesis and Characterization of Imidocubanes with Exocube GeIV and SnIV Substituents: [M(μ3-NGeMe3)]4 (M = Sn, Ge, Pb); [Sn(μ3-NSnMe3)]4.
Inorg Chem 2006;
45:6706-12. [PMID:
16903726 DOI:
10.1021/ic060331y]
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Abstract
The heteroleptic lithium amide, [(Me3Sn)(Me3Ge)NLi.(Et2O)]2 (2), reacts with MCl(2) (M = Sn, Ge, Pb) to yield the corresponding cubane complexes [M(mu3-NGeMe3)]4 [M = Sn (3), Ge (4), Pb (5)]. In an analogous reaction with SnCl2, the lithium stannylamide, [(Me3Sn)2NLi.(Et2O)]2 (1), produces the mixed-valent Sn congener [Sn(mu3-NSnMe3)]4 (6). All imidocubanes contain both di- and tetravalent group 14 metals that are bridged by N. These structures are comprised of M4N4 (M = Sn, Pb, Ge) cores that possess varying distortion from perfect cube geometry. The Pb derivative (5) exhibits enhanced volatility and vapor-phase integrity.
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