Stability, acidity and interaction properties of [Bmim][SbF6] coupled with concentrated sulfuric acid

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2017,（9）
• 页码范围: 1243-1249
• 页数: 7页
• 语种: 英文
• DOI: 10.1007/s11426-017-9022-0

摘要

Ionic liquid coupled with strong acid systems presents considerable promise in some catalytic fields.In the present work,the multiple complex systems composed by 98 wt％ concentrated sulfuric acid and [Bmim][SbF6] were investigated in the terms of stability,acidity and interaction properties.It was found that acidolysis of [Bmim][SbF6] occurred in the 98 wt％ concentrated sulfuric acid accompanied by HF releasing and SbF6-degrading to [SbF6-y(HSO4)y]-.The species after acidolysis in the multiple complex systems were checked and confirmed by electrospray ionization mass spectrometry (ESI-MS),Fourier transform infrared spectroscopy (FT-IR),1H NMR and 19F NMR.Acidity increased slightly with less than 1 wt％ [Bmim][SbF6] addition,while decreased with more proportion,which was determined based on the Hammett acidity functions H0,using 13C NMR.The strong hydrogen bond S-O-H…F of interaction among the multiple complex systems was confirmed by molecular dynamic simulation.