Pseudo-5-fold-symmetrical ligand drives geometric frustration in porous metal-organic and hydrogen-bonded frameworks

Frederik Haase, Gavin A. Craig, Mickaële Bonneau, Kunihisa Sugimoto, Shuhei Furukawa

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Reticular framework materials thrive on designability, but unexpected reaction outcomes are crucial in exploring new structures and functionalities. By combining “incompatible” building blocks, we employed geometric frustration in reticular materials leading to emergent structural features. The combination of a pseudo-C5-symmetrical organic building unit based on a pyrrole core with a C4-symmetrical copper paddlewheel synthon led to three distinct frameworks by tuning the synthetic conditions. The frameworks show structural features typical for geometric frustration: self-limiting assembly, internally stressed equilibrium structures, and topological defects in the equilibrium structure, which manifested in formation of a hydrogen-bonded framework, distorted and broken secondary building units, and dangling functional groups, respectively. The influence of geometric frustration on the CO2 sorption behavior and the discovery of a new secondary building unit shows geometric frustration can serve as a strategy to obtain highly complex porous frameworks.
Original languageEnglish
Pages (from-to)13839-13845
Number of pages7
JournalJournal of the American Chemical Society
Issue number32
Early online date16 Jul 2020
Publication statusPublished - 12 Aug 2020


  • porous materials
  • metal-organic frameworks
  • coordination chemistry
  • gas sorption
  • inorganic chemistry

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