An ato-topology metal-organic framework with large C₂H₂ adsorption and C₂H₂/CO₂ separation capacity

The efficient separation of C₂H₂/CO₂ 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 cm² g^-1 and open-metal-site density of 2.05 mmol cm^-3, resulting in a large C₂H₂ adsorption capacity of (176 cm³ g^-1) and high C₂H₂/CO₂ adsorption selectivity (6.2).