Cu-MOFs with Rich Open Metal and F Sites for Separation of C 2 H 2 from CO 2 and CH 4 .

Herein, we used the 4-fluoro-[1,1'-biphenyl]-3,4',5-tricarboxylic acid (H 3 fbptc) ligand to design and construct a new metal-organic framework (MOF), [Cu 3 (fbptc) 2 (H 2 O) 3 ]·3NMP ( 1 ), which possesses rich accessible metal sites and F functional groups in the porous walls and shows high uptake for C 2 H 2 (119.3 cm 3 g -1 ) and significant adsorption selectivity for C 2 H 2 over CH 4 (14.4) and CO 2 (3.6) at 298 K and 100 kPa. In particular, for the gas mixtures of C 2 H 2 -CH 4 and C 2 H 2 -CO 2 , the MOF reveals large breakthrough time ratios (C 2 H 2 /CH 4 = 13, C 2 H 2 /CO 2 = 5.9), which are particularly prominent in dynamic breakthrough experiments, also confirming the excellent potential for the practical separation of C 2 H 2 from two-component mixtures (C 2 H 2 -CH 4 and C 2 H 2 -CO 2 ) and even three-component mixtures (C 2 H 2 -CO 2 -CH 4 ).