Abstract
The vast structural diversity of metalâorganic frameworks (MOFs) and the ability to tailor the structures makes the materials applicable for a broad range of uses. Traditional bottom-up and top-down design approaches have enabled a rapid increase in this structural diversity, yet the systematic screening for unknown synthesizable MOFs remains a challenge. Here we report a design strategy, the upâdown approach, by merging the bottom-up and top-down approaches. This approach bridges the advantages of both methods, creating a synergistic strategy for discovering MOF structures. Targeting Zr-based MOFs, we search promising topology candidates and unveiled 26 future structural configurations by considering the possible orientations of Zr6 clusters. Through ribbon representation and sophisticated analysis of the ligand angles, we suggest structure models and synthesize Zr6-based MOFs with bct (1) and scu (1) configurations. The upâdown approach will accelerate the discovery of previously unknown or inaccessible MOFs, providing exciting opportunities to expand the chemical space of MOFs.

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Data availability
The data supporting the findings of this study are available in this Article and its Supplementary Information. Crystallographic data for the structures reported in this Article have been deposited at the Cambridge Crystallographic Data Centre (CCDC) under deposition numbers CCDC 2350674 (UMOF-10), 2235854 (UPF-100) and 2235855 (UPF-101). Copies of the data can be obtained free of charge via https://www.ccdc.cam.ac.uk/structures/.
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Acknowledgements
This work was supported by the National Research Foundation (NRF) of Korea (RS-2023-00279793, NRF-2020R1A2C3008226, NRF-2021M3I3A1084909, NRF-2021R1A6A6018767 and NRF-2016R1A5A1009405), the Carbon Neutral Institute Research Fund (1.220099.01) and the UBSI Research Fund (1.230069.01) of Ulsan National Institute of Science and Technology (UNIST). Jiy.K. and H.J.C. acknowledge the support from the NRF grants funded by the Korean Government (NRF-2018H1A2A1061391 (Global Ph.D. Fellowship Program) and NRF-2021R1A6A3A13043905). The authors acknowledge the Pohang Accelerator Laboratory (PAL) for 2D beamline use (2022-2nd-2D-034) and 6D beamline use (2024-1st-6D-A029). The authors thank Junghye Lee, H. Cho and Jinhyu Lee for their valuable discussions and efforts in attempting MOF synthesis.
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Contributions
Conceptualization: W.C., Jiyeon Kim and D.N.; development of UDA methodology and analysis of ligand angles: Jiyeon Kim, D.N. and W.C.; investigation: Jiyeon Kim, D.N., E.C. and W.C.; synthesis and characterization of MOFs: Jiyeon Kim, D.N., H.J.C. and C.C.; synthesis of ligands: H.J.C. and D.S.; DFT calculations: J.L. and Jihan Kim; writingâoriginal draft: Jiyeon Kim and D.N.; writingâreview and editing: Jiyeon Kim, D.N., J.L., Jihan Kim and W.C; funding acquisition: W.C.
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Nature Synthesis thanks Christopher Wilmer, Stefan Wuttke and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Primary Handling Editor: Alison Stoddart, in collaboration with the Nature Synthesis team.
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Supplementary Information
Supplementary figures, discussion, tables and schemes.
Supplementary Data 1
ZIP file of the molecular configuration CIF files.
Supplementary Data 2
ZIP file of the model structure CIF files.
Supplementary Data 3
Crystallographic data for UMOF-10, CCDC 2350674.
Supplementary Data 4
Crystallographic data for UPF-100, CCDC 2235854.
Supplementary Data 5
Crystallographic data for UPF-101, CCDC 2235855.
Supplementary Video 1
Video about the formation process of UPF-101 from UPF-100.
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Kim, J., Nam, D., Cho, H.J. et al. Upâdown approach for expanding the chemical space of metalâorganic frameworks. Nat. Synth 3, 1518â1528 (2024). https://doi.org/10.1038/s44160-024-00638-x
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DOI: https://doi.org/10.1038/s44160-024-00638-x


