Discovery of spontaneous de-interpenetration through charged point-point repulsions

Sylvia L. Hanna, Saumil Chheda, Ryther Anderson, Debmalya Ray, Christos D. Malliakas, Julia G. Knapp, Ken ichi Otake, Peng Li, Penghao Li, Xingjie Wang, Megan C. Wasson, Katarina Zosel, Austin M. Evans, Lee Robison, Timur Islamoglu, Xuan Zhang, William R. Dichtel, J. Fraser Stoddart, Diego A. Gomez-Gualdron, Laura GagliardiOmar K. Farha*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Energetically driven reduction of porosity through entanglement is ubiquitous in nature and synthetic systems. This entanglement decreases valuable internal pore space useful for applications, such as catalysis, storage, and sensing. Here, we describe the discovery of spontaneous de-interpenetration in a 6-fold interpenetrated uranium-based metal-organic framework (MOF), NU-1303-6. De-interpenetration transforms NU-1303-6 (14.2 and 19.8 Å pores) to its larger pore (40.7 Å) non-interpenetrated counterpart, which possesses a record-high 96.6% void fraction and 9.2 cm3g−1 pore volume. Density functional theory calculations reveal that charged point-point repulsions between anionic, closely positioned uranium-based nodes drive this phenomenon. These repulsions compete with water molecules that hydrogen bond nearby networks together, favoring interpenetration. Controlling the interplay between these intermolecular forces enables the reversal of omnipresent energetic equilibria, leading to thermodynamically favored open pore structures. The discovery of charged point-point repulsion will likely lead to the re-evaluation of non-interpenetrated network design, synthesis, and wide-reaching applications.

Original languageEnglish (US)
Pages (from-to)225-242
Number of pages18
JournalChem
Volume8
Issue number1
DOIs
StatePublished - Jan 13 2022

Keywords

  • SDG7: Affordable and clean energy
  • charged point-point repulsion
  • entanglement
  • interpenetration
  • metal–organic framework
  • spontaneous
  • uranium

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Biochemistry, medical
  • Materials Chemistry

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