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Mixed Metal–Organic Framework with Multiple Binding Sites for Efficient C 2 H 2 /CO 2 Separation
Author(s) -
Gao Junkuo,
Qian Xuefeng,
Lin RuiBiao,
Krishna Rajamani,
Wu Hui,
Zhou Wei,
Chen Banglin
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202000323
Subject(s) - stacking , metal organic framework , selectivity , pyrazine , molecule , materials science , gas separation , intermolecular force , metal , separation (statistics) , chemical engineering , chemistry , stereochemistry , adsorption , organic chemistry , computer science , catalysis , metallurgy , biochemistry , machine learning , membrane , engineering
The separation of C 2 H 2 /CO 2 is particularly challenging owing to their similarities in physical properties and molecular sizes. Reported here is a mixed metal–organic framework (M′MOF), [Fe(pyz)Ni(CN) 4 ] ( FeNi‐M′MOF , pyz=pyrazine), with multiple functional sites and compact one‐dimensional channels of about 4.0 Å for C 2 H 2 /CO 2 separation. This MOF shows not only a remarkable volumetric C 2 H 2 uptake of 133 cm 3 cm −3 , but also an excellent C 2 H 2 /CO 2 selectivity of 24 under ambient conditions, resulting in the second highest C 2 H 2 ‐capture amount of 4.54 mol L −1 , thus outperforming most previous benchmark materials. The separation performance of this material is driven by π–π stacking and multiple intermolecular interactions between C 2 H 2 molecules and the binding sites of FeNi‐M′MOF . This material can be facilely synthesized at room temperature and is water stable, highlighting FeNi‐M′MOF as a promising material for C 2 H 2 /CO 2 separation.