Multi‐Molar Absorption of CO 2 by the Activation of Carboxylate Groups in Amino Acid Ionic Liquids

作者：Feng‐Feng Chen, Kuan Huang, Yan Zhou, Ziqi Tian, Xiang Zhu, Duan‐Jian Tao, De‐en Jiang, Sheng Dai · 发表于：Angewandte Chemie International Edition · 年份：2016 · DOI：10.1002/anie.201602919 · 被引用次数：350 · 研究领域：Ionic liquids properties and applications、Carbon Dioxide Capture Technologies、CO2 Reduction Techniques and Catalysts

A new strategy for multi-molar absorption of CO2 is reported based on activating a carboxylate group in amino acid ionic liquids. It was illustrated that introducing an electron-withdrawing site to amino acid anions could reduce the negative inductive effect of the amino group while simultaneously activating the carboxylate group to interact with CO2 very efficiently. An extremely high absorption capacity of CO2 (up to 1.69 mol mol(-1) ) in aminopolycarboxylate-based amino acid ionic liquids was thus achieved. The evidence of spectroscopic investigations and quantum-chemical calculations confirmed the interactions between two kinds of sites in the anion and CO2 that resulted in superior CO2 capacities.