Rational Design and Reticulation of Infinite qbe Rod Secondary Building Units into Metal–Organic Frameworks through a Global Desymmetrization Approach for Inverse C3H8/C3H6 Separation

Wei Gong*, Yi Xie, Akihito Yamano, Sho Ito, Eric W. Reinheimer, Jinqiao Dong, Christos D. Malliakas, Davide M. Proserpio, Yong Cui, Omar K. Farha

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The development of reticular chemistry has enabled the construction of a large array of metal–organic frameworks (MOFs) with diverse net topologies and functions. However, dominating this class of materials are those built from discrete/finite secondary building units (SBUs), yet the designed synthesis of frameworks involving infinite rod-shaped SBUs remain underdeveloped. Here, by virtue of a global linker desymmetrization approach, we successfully targeted a novel Cu-MOF (Cu-ASY) incorporating infinite Cu-carboxylate rod SBUs with its structure determined by micro electron diffraction (MicroED) crystallography. Interestingly, the rod SBU can be simplified as a unique cylindric sphere packing qbe tubule made of [43.62] tiles, which further connect the tritopic linkers to give a newly discovered 3,5-connected gfc net. Cu-ASY is a permanent ultramicroporous material featuring 1D channels with highly inert surfaces and shows a preferential adsorption of propane (C3H8) over propene (C3H6). The efficiency of C3H8 selective Cu-ASY is validated by multicycle breakthrough experiments, giving C3H6 productivity of 2.2 L/kg. Density functional theory (DFT) calculations reveal that C3H8 molecules form multiple C−H⋅⋅⋅π and atypical C−H⋅⋅⋅ H−C van der Waals interactions with the inner nonpolar surfaces. This work therefore highlights the linker desymmetrization as an encouraging and intriguing strategy for achieving unique MOF structures and properties.

Original languageEnglish (US)
Article numbere202318475
JournalAngewandte Chemie - International Edition
Volume63
Issue number5
DOIs
StatePublished - Jan 25 2024

Keywords

  • Desymmetrization
  • Gas Separation
  • Metal–Organic Framework
  • Rod SBU
  • Topology

ASJC Scopus subject areas

  • General Chemistry
  • Catalysis

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