Research Article


2021, 14(2): 376–380


Reticular exploration of uranium-based metal–organic frameworks with hexacarboxylate building units

Zhijie Chen1 (✉), Penghao Li1, Xuan Zhang1, Mohammad Rasel Mian1, Xingjie Wang1, Peng Li1, Zhichang Liu1, Michael O’Keeffe2, J. Fraser Stoddart1,3,4, and Omar K. Farha1,5 (✉)

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1 Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
2 School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA
3 Institute for Molecular Design and Synthesis, Tianjin University, 92 Weijin Road, Tianjin 300072, China
4 School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
5 Department of Chemical & Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA

Keywords: reticular chemistry, uranium-based metal–organic frameworks (MOFs), hexacarboxylate, 3,6-connected net, catenation, actinide
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  • Abstract
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The rational reticular design of metal–organic frameworks (MOFs) from building units of known geometries is essential for enriching the diversity of MOF structures. Unexpected and intriguing structures, however, can also arise from subtle changes in the rigidity/length of organic linkers and/or synthetic conditions. Herein, we report three uranium-based MOF structures—i.e., NU-135X (X = 0, 1, 2)—synthesized from trigonal planar uranyl nodes and triptycene-based hexacarboxylate ligands with variable arm lengths. A new chiral 3,6-connected nuc net was observed in NU-1350, while the extended versions of the ligand led to 3-fold catenated MOFs (NU-1351 and NU-1352) with rare 3,6-connected cml-c3 nets. The differences in the topology of NU-1350 and NU-1351/NU-1352 could be attributed to the slight distortions of the shorter linker in the former from the ideal trigonal prism geometry to an octahedral geometry when coordinated to the trigonal planar uranyl nodes.
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Reticular exploration of uranium-based metal–organic frameworks with hexacarboxylate building units. Nano Res. 2021, 14(2): 376–380

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