C2H2/CO2 Separation with a Chain‐Type Zn Pyrazolate MOF

A novel Zn dipyrazolate metal‐organic framework (MOF), Zn(azbpz) (azbpz2−=4,4′‐azobis(3,5‐dimethylpyrazolate), has been synthesized and structurally characterized using micro‐crystal electron diffraction. The framework contains chain‐type secondary building units comprised of tetrahedral Zn2+ ions b...

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Bibliographic Details
Published in:European journal of inorganic chemistry 2024-01, Vol.27 (1), p.n/a
Main Authors: Berkbigler, Grant, Liu, Qiao, Hoefer, Nicole, Xie, Yi, Hilliard, Jordon S., McComb, David W., Wade, Casey R.
Format: Article
Language:English
Subjects:
Acetylene
Carbon dioxide
Electron diffraction
Functional groups
Gas mixtures
gas separation
Metal-organic frameworks
pyrazoles
Selective adsorption
Separation
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Summary:A novel Zn dipyrazolate metal‐organic framework (MOF), Zn(azbpz) (azbpz2−=4,4′‐azobis(3,5‐dimethylpyrazolate), has been synthesized and structurally characterized using micro‐crystal electron diffraction. The framework contains chain‐type secondary building units comprised of tetrahedral Zn2+ ions bridged by pyrazolate groups, resulting in guest‐accessible channels lined with methyl and azo functional groups. CO2, C2H2, C2H4, C2H6, C3H6, and C3H8 gas adsorption isotherms were measured to investigate the potential of Zn(azbpz) as an adsorbent for selective separation of binary gas mixtures. The data reveal selective adsorption of acetylene over CO2, and column breakthrough experiments demonstrate good performance for C2H2/CO2 separation. Zn(azbpz) has been synthesized from 4,4′‐azobis(3,5‐dimethylpyrazolate) linkers, filling a gap in the isoreticular series of dipyrazolate metal‐organic frameworks (MOFs) with chain‐type metal nodes. The new MOF features narrow, guest‐accessible channels that promote selective adsorption of acetylene over CO2 and exhibits good performance for C2H2/CO2 separation under dynamic conditions.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.202300548