期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 14, 期 1, 页码 234-239出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200701466
关键词
asymmetric catalysis; donor-acceptor systems; Lewis acids; Lewis bases; silicon
The solution and solid-state structures of hexamethylphosphoramide (HMPA) adducts of tetrachlorosilane (SiCl4) are discussed. In solution, the meridional and facial isomers of the hexa-coordinate cationic complex 3HMPA center dot SiCl3+ Cl- (2) predominate at all HMPA concentrations, and are in equilibrium with the hexa-coordinate neutral trans- and cis-2HMPA center dot SiCl4 complexes (1), as well as the penta-coordinate cationic cis-2 HMPA center dot SiCl3+Cl- (3). Single crystal X-ray analyses are reported for the ionized mer-3HMPA center dot SiCl3+HCl2- and the neutral trans-2HMPA center dot SiCl4 complexes.
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