title: Multi-Molar Absorption of CO2 by the Activation of Carboxylate Groups in Amino Acid Ionic Liquids.
abstract: 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.
authors.affiliation: College of Chemistry and Chemical Engineering, Jiangxi Inorganic Membrane Materials Engineering Research Centre, Jiangxi Normal University, Nanchang, 330022, China.
authors.forename: Feng-Feng
authors.initials: FF
authors.lastname: Chen
authors.affiliation: Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
authors.forename: Kuan
authors.initials: K
authors.lastname: Huang
authors.affiliation: College of Chemistry and Chemical Engineering, Jiangxi Inorganic Membrane Materials Engineering Research Centre, Jiangxi Normal University, Nanchang, 330022, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Department of Chemistry, University of California, Riverside, CA, 92521, USA.
authors.forename: Zi-Qi
authors.initials: ZQ
authors.lastname: Tian
authors.affiliation: Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhu
authors.affiliation: College of Chemistry and Chemical Engineering, Jiangxi Inorganic Membrane Materials Engineering Research Centre, Jiangxi Normal University, Nanchang, 330022, China. djtao@jxnu.edu.cn, dtao1@utk.edu.|Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA. djtao@jxnu.edu.cn, dtao1@utk.edu.
authors.forename: Duan-Jian
authors.initials: DJ
authors.lastname: Tao
authors.affiliation: Department of Chemistry, University of California, Riverside, CA, 92521, USA.
authors.forename: De-En
authors.initials: DE
authors.lastname: Jiang
authors.affiliation: Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA. dais@ornl.gov.|Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA. dais@ornl.gov.
authors.forename: Sheng
authors.initials: S
authors.lastname: Dai
keywords: CO2 capture; amino acids; carboxylate group activation; ionic liquids; multiple site interactions