Porous materials capable of selectively capturing COfrom flue-gases or natural gas are of interest in terms of rising atmospheric COlevels and methane purification. Size-exclusive sieving of COover CHand Nhas rarely been achieved. Herein we show that a crystal engineering approach to tuning of pore-size in a coordination network, [Cu(quinoline-5-carboxyate)](Qc-5-Cu) ena+bles ultra-high selectivity for COover N(S≈40 000) and CH(S≈3300). Qc-5-Cu-sql-β, a narrow pore polymorph of the square lattice (sql) coordination network Qc-5-Cu-sql-α, adsorbs COwhile excluding both CHand N. 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.
Kaijie Chen David Madden Tony Pham Katherine Forrest Amrit Kumar Qingyuan Yang Xue Wei Brian Space Perry Iv John J. Jiepeng Zhang 陈小明 Michael Zaworotko
Angewandte Chemie - International Edition
2016