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Communications Novel Aggregation Motif of gem-Dilithiosilanes: Coaggregation of

Summary: Communications
Novel Aggregation Motif of gem-Dilithiosilanes: Coaggregation of
Two R2SiLi2 Molecules with Two RLi Molecules
Dmitry Bravo-Zhivotovskii,* Gregory Molev, Victoria Kravchenko, Mark Botoshansky,
Asher Schmidt, and Yitzhak Apeloig
Department of Chemistry and the Lise Meitner MinerVa Center for Computational Quantum Chemistry,
Technion-Israel Institute of Technology, Haifa 32000, Israel
ReceiVed May 29, 2006
Summary: Three noVel nonsolVated gem-dilithiosilanes, R2SiLi2,
were prepared by reacting in hexane lithium metal with silyl
mercury precursors. X-ray structure analysis showed for two
of them an unprecedented coaggregation of two R2SiLi2
molecules with two RLi molecules, exhibiting noVel structural
motifs: the Li6 core in these coaggregates is strongly distorted
from the classic Li6 core of (RLi)6, and each R2Si group bridges
simultaneously two Li triangles of the Li6 core.
In nonsolvated aggregates of alkyllithium1 and silyllithium2
((R3ELi)n, E ) C, Si) the lithium atoms form a core with the
R3E groups bridging several lithium atoms.1,2 For example, in
(t-BuLi)4 the lithium atoms form a tetrahedral core,3 and in (Me3-


Source: Apeloig, Yitzhak - Department of Chemistry, Technion, Israel Institute of Technology


Collections: Chemistry