An ato-topology metal-organic framework with large C 2 H 2 adsorption and C 2 H 2 /CO 2 separation capacity.

The efficient separation of C 2 H 2 /CO 2 is challenging and energy intensive due to their similar molecular shapes and kinetic diameters. Here we report an ato-topology metal-organic framework (JNU-7a) with a specific surface area of 2046 cm 2 g -1 and open-metal-site density of 2.05 mmol cm -3 , resulting in a large C 2 H 2 adsorption capacity of (176 cm 3 g -1 ) and high C 2 H 2 /CO 2 adsorption selectivity (6.2).