期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 27, 期 43, 页码 11041-11044出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202101845
关键词
Lewis amphoteric; perfluoroalkyls; silicon; silanolates; silanol; siloxanes
资金
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [HO 2011/12-1]
- Projekt DEAL
This study focused on investigating the Lewis amphoteric behavior of perfluoroalkyl siloxanes and their congener species, revealing the strong electron-withdrawing properties of pentafluoroethyl substituents. The synthesis of corresponding silanol and characterization of dimeric triorganosilanolate provided evidence for the Lewis amphoteric character of the monomeric anion.
While alkyl-substituted siloxanes are widely known, virtually nothing is known about perfluoroalkyl siloxanes and their congener species, the silanols and silanolates. We recently reported on the tris(pentafluoroethyl)silanide ion, [Si(C2F5)(3)](-), which features Lewis amphoteric character deriving from the pentafluoroethyl substituents and their strong electron-withdrawing properties. Transferring this knowledge, we investigated the Lewis amphoteric behavior of the tris(pentafluoroethyl)silanolate, [Si(C2F5)(3)O](-). In order to examine such Lewis amphoteric behavior, we first developed a strategy for the synthesis of the corresponding silanol Si(C2F5)(3)OH, which readily condenses at room temperature to the hexakis(pentafluoroethyl)disiloxane, (C2F5)(3)SiOSi(C2F5)(3). Deprotonation of Si(C2F5)(3)OH employing a sterically demanding phosphazene base allows the characterization of the first example of a dimeric triorganosilanolate: the dianionic hexakis(pentafluoroethyl)disilanolate, [{Si(C2F5)(3)O}(2)](2-), implies Lewis amphoteric character of the monomeric [Si(C2F5)(3)O](-) anion.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据