Branched Star-Type Polysilyllithium Compounds: The Effects of β-Silyl Substitution and of Complexation on Their Molecular Structure.
It was fortunate that the first extended branched polysilyl anion (Me3 SiMe2 Si)3 Si(-) could be crystallographically characterized in two forms-as the THF complex 1 and as the dimer 2. Comparison with the analogous (Me3 Si)3 SiLi systems 3 and 4 shows that β-Me3 Si substitution and complexation by THF elongate the Si-Li distance by 0.09-0.14 Å and 0.04-0.07 Å, respectively.
Department of Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry Technion-Israel Institute of Technology 32000 Haifa, Israel, Fax: (+972) 48233735. chrapel@tx.technion.ac.il.
Y
Y
Apeloig
M
M
Yuzefovich
M
M
Bendikov
D
D
Bravo-Zhivotovskii
D
D
Bläser
R
R
Boese
anions; density functional calculations; lithium; silicon