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Tuning Pore Size in Square‐Lattice Coordination Networks for Size‐Selective Sieving of CO2 |
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| Authors: | Dr. Kai‐Jie Chen Dr. David G. Madden Dr. Tony Pham Katherine A. Forrest Amrit Kumar Dr. Qing‐Yuan Yang Dr. Wei Xue Prof. Dr. Brian Space Dr. John J. Perry IV Prof. Dr. Jie‐Peng Zhang Prof. Dr. Xiao‐Ming Chen Prof. Dr. Michael J. Zaworotko |
| Affiliation: | 1. Department of Chemical & Environmental Sciences, Bernal Institute, University of Limerick, Plassey House, Limerick, Republic of Ireland;2. MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, P.R. China;3. Department of Chemistry, University of South Florida, Tampa, FL, USA |
| Abstract: | Porous materials capable of selectively capturing CO2 from flue‐gases or natural gas are of interest in terms of rising atmospheric CO2 levels and methane purification. Size‐exclusive sieving of CO2 over CH4 and N2 has rarely been achieved. Herein we show that a crystal engineering approach to tuning of pore‐size in a coordination network, [Cu(quinoline‐5‐carboxyate)2]n ( Qc‐5‐Cu ) ena+bles ultra‐high selectivity for CO2 over N2 (SCN≈40 000) and CH4 (SCM≈3300). Qc‐5‐Cu‐sql‐β , a narrow pore polymorph of the square lattice ( sql ) coordination network Qc‐5‐Cu‐sql‐α, adsorbs CO2 while excluding both CH4 and N2. Experimental measurements and molecular modeling validate and explain the performance. Qc‐5‐Cu‐sql‐β is stable to moisture and its separation performance is unaffected by humidity. |
| Keywords: | CO2 separation gas sorption molecular sieving effect stability supramolecular isomerism |