An Ultramicroporous Hydrogen‐Bonded Organic Framework Exhibiting High C2H2/CO2Separation

Abstract

AbstractThe separation of C2H2/CO2is not only industrially important for acetylene purification but also great scientific challenge due to their very similar molecular size and physical properties. To address this difficulty, herein, we present an ultramicroporous hydrogen‐bonded organic framework (HOF‐FJU‐1) from tetracyano bicarbazole to separate C2H2from CO2by taking advantage of differences in their electrostatic potential distribution. This material possesses a suitable pore environment and electrostatic potential distribution fitting well to C2H2, thus showing extra strong affinity to C2H2(46.73 kJ mol−1) and the highest IAST selectivity of 6675 for C2H2/CO2separation among the adsorbents reported. The single crystal X‐ray diffraction reveals that the suitable pore environment in HOF‐FJU‐1 provides multiple C−H⋅⋅⋅π and hydrogen‐bonded interactions N⋅⋅⋅H−C with C2H2molecules. Dynamic breakthrough experiments demonstrate its outstanding separation performance to C2H2/CO2mixtures.