氢键供体调控低共熔溶剂捕集二氧化碳机理的实验设计

Experimental Design of Tuning CO_(2) Capture Mechanisms of Deep Eutectic Solventsby Hydrogen Bond Donors

设计了氢键供体调控低共熔溶剂捕集二氧化碳机理的教学实验。制备低共熔溶剂所使用的氢键受体为四乙基铵4-甲氧基苯酚盐([Et_(4)N][4-MP]),氢键供体为乙二醇(EG)和咪唑(Im)。核磁共振谱、红外光谱表征结果表明,[Et_(4)N][4-MP]∶EG (1∶2,物质的量比,下同)和[Et_(4)N][4-MP]∶Im (1∶2)具有不同的碳捕集机理。CO_(2)与溶剂[Et_(4)N][4-MP]∶EG (1∶2)的阴离子[4-MP]~-和EG都发生了反应。但是,CO_(2)与溶剂[Et_(4)N][4-MP]∶Im (1∶2)的阴离子[4-MP]~-发生了反应,未与Im反应。该实验既能培养学生的文献检索、合成操作以及谱图分析等能力,又能够使学生认识和理解物质的结构对反应机理的重要影响,同时使学生了解“双碳”热点问题,有利于学生的学习兴趣和科学研究能力的培养。

In this work,a teaching experiment was designed to tune CO_(2)capture mechanisms of deep eutectic solvents(DESs)using hydrogen bond donors.The hydrogen bond acceptor used for the synthesis of DESs was tetraethylammonium 4-methoxyphenoate([Et_(4)N][4-MP]),and the hydrogen bond donors were ethylene glycol(EG)and imidazole(Im).The characterization results of nuclear magnetic resonance(NMR)and Fourier transform infrared(FTIR)indicated that[Et_(4)N][4-MP]∶EG(1∶2,molar ratio)and[Et_(4)N][4-MP]∶Im(1∶2)featured different carbon capture mechanism.CO_(2)reacted with both the anion[4-MP]-and EG contained in the solvent[Et_(4)N][4-MP]∶EG(1∶2).However,CO_(2)reacted with the anion[4-MP]-in the solvent[Et_(4)N][4-MP]∶Im(1∶2),but did not react with Im in the system.Through this experiment,students’quality in literature retrieval,experiment operation,and spectra analysis will be trained,and students can recognize and understand the important impact of compounds’structure on reaction mechanisms and learn the hot topic of“double carbon”at the same time,which is conducive to stimulating their learning interest and cultivating their scientific research ability.