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Highly Efficient Carbon Monoxide Capture by Carbanion-Functionalized Ionic Liquids through C-Site Interactions |
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| Authors: | Prof. Dr. Duan-Jian Tao Feng-Feng Chen Dr. Zi-Qi Tian Dr. Kuan Huang Dr. Shannon M. Mahurin Prof. Dr. De-en Jiang Prof. Dr. Sheng Dai |
| Affiliation: | 1. College of Chemistry and Chemical Engineering, Jiangxi Inorganic Membrane Materials Engineering Research Centre, Jiangxi Normal University, Nanchang, 330022 P.R. China;2. Department of Chemistry, University of California, Riverside, CA, 92521 USA;3. School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang, 330031 P.R. China Department of Chemistry, University of Tennessee, Knoxville, TN, 37996 USA;4. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831 USA;5. Department of Chemistry, University of Tennessee, Knoxville, TN, 37996 USA |
| Abstract: | A novel method for the highly efficient and reversible capture of CO in carbanion-functionalized ionic liquids (ILs) by a C-site interaction is reported. Because of its supernucleophilicity, the carbanion in ILs could absorb CO efficiently. As a result, a relatively high absorption capacity for CO (up to 0.046 mol mol−1) was achieved under ambient conditions, compared with CO solubility in a commonly used IL [Bmim][Tf2N] (2×10−3 mol mol−1). The results of quantum mechanical calculations and spectroscopic investigation confirmed that the chemical interaction between the C-site in the carbanion and CO resulted in the superior CO absorption capacities. Furthermore, the subsequent conversion of captured CO into valuable chemicals with good reactivity was also realized through the alkoxycarbonylation reaction under mild conditions. Highly efficient CO absorption by carbanion-functionalized ILs provides a new way of separating and converting CO. |
| Keywords: | carbanions CO capture C-sites ionic liquids supernucleophilicity |