The safe storage of flammable gases, such as acetylene, is essential for current industrial purposes. However, the narrow pressure (P) and temperature range required for the industrial use of pure acetylene (100 < P < 200 kPa at 298 K) and its explosive behaviour at higher pressures make its storage and release challenging. Flexible metal–organic frameworks that exhibit a gated adsorption/desorption behaviour—in which guest uptake and release occur above threshold pressures, usually accompanied by framework deformations—have shown promise as storage adsorbents. Herein, the pressures for gas uptake and release of a series of zinc-based mixed-ligand catenated metal–organic frameworks were controlled by decorating its ligands with two different functional groups and changing their ratio. This affects the deformation energy of the framework, which in turn controls the gated behaviour. The materials offer good performances for acetylene storage with a usable capacity of ~90 v/v (77% of the overall amount) at 298 K and under a practical pressure range (100–150 kPa).
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X-ray crystallographic data have been deposited at the CCDC (http://www.ccdc.cam.ac.uk/) under CCDC no. 2036574 (as-synthesized Zn-CAT-(NO2)100) and no. 2036575 (activated Zn-CAT-(NO2)100). A copy of the data can be obtained free of charge via https://www.ccdc.cam.ac.uk/structures/. All other data supporting the findings of this study are available within the article and its Supplementary Information. Source data are provided with this paper. The source data for Supplementary Figs. 29–32 are available in Supplementary Data 3. Data are also available from the corresponding author upon reasonable request.
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This work was supported by Air Liquide via the 2016 Air Liquide Scientific Challenge, a KAKENHI Grant-in-Aid for Specially Promoted Research (JP25000007), Scientific Research (S) (JP18H05262) and Early-Career Scientists (JP19K15584) from the Japan Society of the Promotion of Science. Synchrotron X-ray diffraction measurements were performed at the Japan Synchrotron Radiation Institute, Super Photon Ring – 8 GeV (proposal nos 2018B1820 and 2019A1136). We acknowledge iCeMS Analysis Centre for access to analytical facilities.
We are grateful to CNRS-Kyoto LIA ‘SMOLAB’. In addition, we thank Air Liquide Japan, P. Ginet and L. Prost, as well as the technical staff for advice and experimental assistance.
R. Réau is senior scientific director of research and development and group senior fellow of Air Liquide, France. C. Lavenn, research project manager, and T. Ogawa are employed at Air Liquide Laboratories Innovation Campus in Tokyo, Japan. S. Kitagawa was partially funded by Air Liquide in the frame of a collaboration research agreement between Air Liquide and Kyoto University. The other authors do not declare any competing interests.
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Supplementary Figs. 1–49, Tables 1–5 and Discussion.
Crystallographic data for the activated Zn-CAT-(NO2) (CCDC no. 2036575).
Crystallographic data for the as-synthesized Zn-CAT-(NO2) (CCDC no. 2036574).
Source data for Supplementary Figs. 29–32.
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Bonneau, M., Lavenn, C., Zheng, JJ. et al. Tunable acetylene sorption by flexible catenated metal–organic frameworks. Nat. Chem. 14, 816–822 (2022). https://doi.org/10.1038/s41557-022-00928-x
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