Tribromide Ionic Liquids: Probing the Charge Distribution of the Anion by XPS
摘要:
We investigate a typical trihalide ionic liquid, 1-octyl-3-methylimidazolium tribromide, using X-ray photoelectron spectroscopy. The electronic environment of the anion is analyzed in detail. The Br 3d binding energies of the two components are both higher than that measured for 1-octyl-3-methylimidazolium bromide, due to the delocalization of the negative charge spreading over three atoms within the anion. The basicity of [Br-3](-) is estimated based upon N 1s binding energy. It is found similar to that of [BF4](-).
Using the ‘Chemical Tunability’ of Ionic Liquids to Increase Sustainability in the Electrophilic Bromination of Unsaturated Compounds
作者:Cinzia Chiappe、Angelo Sanzone
DOI:10.1055/s-0030-1260097
日期:2011.8
Tribromide-based ionicliquids have been synthesized and investigated as efficient bromination agents. The different physicochemical properties of the reaction media, which depend on the cation structure, have been used to improve the efficiency of the bromination process. electrophilic addition - ionicliquids - stereoselectivity - bromination - green chemistry