Two novel ionic liquids,[Bzmim]Cl and[Bzmim][AuCl_(4)],were successfully synthesized and characterized by ^(1)H NMR spectroscopy,single crystal structure analysis and quantum mechanical calculations.Meanwhile,multiple...Two novel ionic liquids,[Bzmim]Cl and[Bzmim][AuCl_(4)],were successfully synthesized and characterized by ^(1)H NMR spectroscopy,single crystal structure analysis and quantum mechanical calculations.Meanwhile,multiple supramolecular interactions of[Bzmim][AuCl_(4)](hydrogen bonds,Cl…π,Au…π interactions and π-π stacking)were found between the N-methylimidazolium cation and AuCl_(4)^(-).Interestingly,the interactions made it easy for[Bzmim][AuCl_(4)]to form a 3D supramolecular structure.Thus,a series of N-methylimidazolium-based poly(ionic liquids)were synthesized to recover Au(Ⅲ)in aqueous solution.They show high adsorption capacity and excellent selectivity for tetrachloroaurate anions which can be used as solid phase extraction agents over a wide temperature range.Notably,the acid thiourea can desorb Au(Ⅲ)from polymeric ionic liquids(PILs),thus they also exhibit excellent recyclability.Among them,PS-b-PVBnMeImCl-5.9 has the highest efficiency for Au(Ⅲ)recovery after five adsorption-desorption cycles.Compared with the Raman spectroscopy results of gold-containing PS-b-PVBnMeImCl-5.9,1H NMR of[Bzmim][AuCl4]revealed that the Au(Ⅲ)recovery mechanism by polymeric ionic liquids was due to a combination of electrostatic interactions and multiple weak intermolecular interactions.展开更多
基金supported by the National Natural Science Foundation of China(Grant 51474118).
文摘Two novel ionic liquids,[Bzmim]Cl and[Bzmim][AuCl_(4)],were successfully synthesized and characterized by ^(1)H NMR spectroscopy,single crystal structure analysis and quantum mechanical calculations.Meanwhile,multiple supramolecular interactions of[Bzmim][AuCl_(4)](hydrogen bonds,Cl…π,Au…π interactions and π-π stacking)were found between the N-methylimidazolium cation and AuCl_(4)^(-).Interestingly,the interactions made it easy for[Bzmim][AuCl_(4)]to form a 3D supramolecular structure.Thus,a series of N-methylimidazolium-based poly(ionic liquids)were synthesized to recover Au(Ⅲ)in aqueous solution.They show high adsorption capacity and excellent selectivity for tetrachloroaurate anions which can be used as solid phase extraction agents over a wide temperature range.Notably,the acid thiourea can desorb Au(Ⅲ)from polymeric ionic liquids(PILs),thus they also exhibit excellent recyclability.Among them,PS-b-PVBnMeImCl-5.9 has the highest efficiency for Au(Ⅲ)recovery after five adsorption-desorption cycles.Compared with the Raman spectroscopy results of gold-containing PS-b-PVBnMeImCl-5.9,1H NMR of[Bzmim][AuCl4]revealed that the Au(Ⅲ)recovery mechanism by polymeric ionic liquids was due to a combination of electrostatic interactions and multiple weak intermolecular interactions.
