Modulated synthesis of hcp MOFs for preferential CO 2 capture.

We herein show that the μ 2 -OH bridging groups in the double M 12 O 8 (OH) 14 clusters of hcp UiO-66 could act as a preferential CO 2 sorption site, compared to fcu UiO-66. As such, hcp-UiO-66-0.015 shows a high binary CO 2 sorption capacity of 0.31 mmol g -1 and CO 2 /N 2 (15/85) mixture selectivity of 87 at 298 K and 1 bar, which holds great potential for post-combustion CO 2 capture.