Volume 137, Issue 9 e202411150
Forschungsartikel

Multiple Structural and Phase Transformations of MOF and Selective Hydrocarbon Gas Separation in its Amorphous, Glass Phase States

Dr. Jian Li

Dr. Jian Li

School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004 P. R. China

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Jia-Xin Wu

Jia-Xin Wu

School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004 P. R. China

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Tao Liu

Tao Liu

College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004 P. R. China

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Jian Yang

Jian Yang

College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062 P. R. China

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Mei-Ling Wei

Mei-Ling Wei

School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004 P. R. China

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Chuang Yang

Chuang Yang

College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062 P. R. China

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Dr. Qiubing Dong

Dr. Qiubing Dong

School of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 P. R. China

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Prof. Dr. Zheng Yin

Corresponding Author

Prof. Dr. Zheng Yin

School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004 P. R. China

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Prof. Dr. Mohamedally Kurmoo

Prof. Dr. Mohamedally Kurmoo

School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004 P. R. China

Strasbourg Institute of Chemistry, University of Strasbourg, 4 Blaise Pascal Road, Strasbourg, Sedex, 67008 France

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Prof. Dr. Ming-Hua Zeng

Corresponding Author

Prof. Dr. Ming-Hua Zeng

School of Chemistry and Pharmaceutical Sciences, State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004 P. R. China

College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004 P. R. China

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First published: 13 August 2024

Abstract

The first wide-view image of multiple structural and phase transformations for MOFs, ranging from crystal state transformations to the extreme limit approaching liquid/glass phase, was presented. The process involves i) an initial crystalline transformation from square-layer framework [Co2(pybz)2(CH3COO)2] ⋅ DMF (Co2) to a 3-fold interpenetrated and ordered vacancies contained framework [Co(pybz)2(CH3OH)2] ⋅ 2CH3OH (CoM) due to in situ disassemble-reassemble, ii) thermal induced departure of a pair of cis-form coordinated methanol in CoM leads to amorphous framework a-dCoM, iii) glass transition to super-cooled liquid scl-dCoM, iv) obtaining MOF glass g-dCoM upon quenching the super-cooled liquid, and v) re-crystallization of super-cooled liquid generates 6-fold interpenetrated dia-net framework [Co(pybz)2]6n (rec-dCoM) under further heating. The access to glass from CoM, provides a new self-perturbation strategy to create MOF glasses without melting. The wider pore size distribution in amorphous/glassy MOFs than crystalline precursor achieved the first time selective hydrocarbon gas separation by breakthrough experiments, which bring efficient separation of 1 : 99 C2H2/C2H4 by either a-dCoM or g-dCoM and produce polymer grade C2H4 with purity≥99.5 % after a single adsorption process. Furthermore, the mixture of 50 : 50 C3H6/C3H8 can be separated by a-dCoM.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.