4.8 Article

Formation and fine-tuning of metal-organic frameworks with carboxylic pincers for the recognition of a C2H2 tetramer and highly selective separation of C2H2/C2H4

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CHEMICAL SCIENCE
卷 14, 期 17, 页码 4605-4611

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d3sc00877k

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Researchers have finely tuned a new family of MOFs with carboxylic pincers to separate ethylene and acetylene efficiently, achieving high selectivity and purity of the products. This work provides a novel approach for designing high-performance MOFs by selectively binding small molecular clusters.
Highly efficient ethylene (C2H4) and acetylene (C2H2) separation is a great challenge and an important process in current industries. Herein, we finely tune a new family of 6-c metal-organic frameworks (MOFs) with crab-like carboxylic pincers for the recognition of a C2H2 tetramer and afford NTU-72 with high adsorption C2H2/C2H4 selectivity (56-441, 298 K) as well as unprecedented recovery of both highly pure C2H4 (99.95%) and C2H2 (99.36%). Furthermore, the effective binding of a C2H2 tetramer by NTU-72's carboxylic pincers has been revealed by gas-loaded crystallography and Raman spectral studies. Our work provides a novel approach for the selective binding of a small molecular cluster for designing high-performance MOFs.

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