A Charge-Assisted Hydrogen-Bonded Organic Framework for C ₃ H ₆ /C ₂ H ₄ Separation

A charge-assisted hydrogen-bonded organic framework, NJTech-HOF-2, was synthesized using H 4 BTEB and in situ-generated dimethylammonium cations. The framework features enhanced structural stability through interlayer charge-assisted hydrogen bonding and exhibits permanent microporosity with 1D channels (∼9 × 11 Å). Gas adsorption studies reveal that NJTech-HOF-2 displays a high affinity and selectivity for propylene (C 3 H 6 ) over ethylene (C 2 H 4 ), with an IAST selectivity of up to 5.16 at 298 K. This material demonstrates good thermal stability and practical separation capability, as validated by fixed-bed breakthrough experiments, making it a promising candidate for efficient C 3 H 6 /C 2 H 4 separation.