A flexible-robust metal-organic framework for efficient C2H2/C2H4 separation.

• ZJU-194a features the unique flexible-robust network. • ZJU-194a affords high adsorptive C 2 H 2 /C 2 H 4 selectivity. • The distinct host–guest affinity accounts for different gate open-close states. The removal of trace acetylene (C 2 H 2) from raw ethylene (C 2 H 4) stream is critical for production of polymer-grade chemicals. We herein report a perchlorate-coordinated metal–organic framework (ZJU-194) featuring flexible-robust network for efficient C 2 H 2 /C 2 H 4 separation. The distinct-different host–guest affinity accounts for two-step gate-opening adsorption of C 2 H 2 , but gate-close of C 2 H 4. It thus affords very high adsorptive selectivity (28.9) at ambient conditions, endowing ZJU-194 among one of the top-performing porous materials for C 2 H 2 /C 2 H 4 separation. [ABSTRACT FROM AUTHOR]