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Nano Research

Article Title

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

Authors

Zhijie Chen, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
Penghao Li, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
Xuan Zhang, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
Mohammad Rasel Mian, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
Xingjie Wang, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
Peng Li, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
Zhichang Liu, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA
Michael O’Keeffe, School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA
J. Fraser Stoddart, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA;Institute for Molecular Design and Synthesis, Tianjin University, 92 Weijin Road, Tianjin 300072, China;School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
Omar K. Farha, Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA;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

Abstract

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.

Publisher

Tsinghua University Press

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