Stability,acidity and interaction properties of [Bmim][SbF_6] coupled with concentrated sulfuric acid  

作　　者：Honghua Zhang Ruixia Liu Ruirui Zhang Feng Huo Zhiqiang Yang Bin He Suojiang Zhang Yanji Wang 

机构地区：[1]School of Chemical Engineering,Hebei University of Technology [2]Key Laboratory of Green Process and Engineering,Beijing Key Laboratory of Ionic Liquids Clean Process,State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences

出　　处：《Science China Chemistry》2017年第9期1243-1249,共7页中国科学（化学英文版）

基　　金：supported by the One Hundred Talent Program of CAS;National Natural Science Foundation of China Petroleum & Chemical Corporation Joint Fund(U1662129);Key Program of National Natural Science Foundation of China(91434203);Key Research Program ofFrontier Sciences,CAS(QYZDY-SSW-JSCO11);State Key Laboratory of Multiphase Complex Systems,IPE,CAS(MPCS-2015-A-05)

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 and19F 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, using13C NMR. The strong hydrogen bond S–O–HF of interaction among the multiple complex systems was confirmed by molecular dynamic simulation. © 2017, Science China Press and Springer-Verlag Berlin Heidelberg.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][SbF_6]were investigated in the terms of stability,acidity and interaction properties.It was found that acidolysis of[Bmim][SbF_6]occurred in the 98 wt%concentrated sulfuric acid accompanied by HF releasing and SbF_6~ degrading to[SbF_(6-y)XHSO_4]_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 ^(19)F NMR.Acidity increased slightly with less than 1 wt%[Bmim][SbF_6]addition,while decreased with more proportion,which was determined based on the Hammett acidity functions H_0,using ^(13)C NMR.The strong hydrogen bond S-O-H…F of interaction among the multiple complex systems was confirmed by molecular dynamic simulation.

关 键 词：ELECTRODEPOSITION Electrospray ionization Fourier transform infrared spectroscopy Hydrogen bonds Ionic liquids Mass spectrometry Molecular dynamics Sulfuric acid 

分 类 号：O643.36[理学—物理化学] O645.1[理学—化学]