Shape-Memory Effect Triggered by π-π Interactions in a Flexible Terpyridine Metal-Organic Framework

Research output: Contribution to journalResearch articleContributedpeer-review


  • Kornel Roztocki - , Adam Mickiewicz University in Poznań (Author)
  • Wiktoria Gromelska - , Adam Mickiewicz University in Poznań (Author)
  • Filip Formalik - , Wrocław University of Science and Technology, Northwestern University (Author)
  • Alessia Giordana - , University of Turin (Author)
  • Luca Andreo - , University of Turin (Author)
  • Ghodrat Mahmoudi - , University of Maragheh (Author)
  • Volodymyr Bon - , Chair of Inorganic Chemistry I (Author)
  • Stefan Kaskel - , Chair of Inorganic Chemistry I (Author)
  • Leonard J. Barbour - , University of Stellenbosch (Author)
  • Agnieszka Janiak - , Adam Mickiewicz University in Poznań (Author)
  • Emanuele Priola - , University of Turin (Author)


Shape-memory polymers and alloys are adaptable materials capable of reversing from a deformed, metastable phase to an energetically favored original phase in response to external stimuli. In the context of metal-organic frameworks, the term shape-memory is defined as the property of a switchable framework to stabilize the reopened pore phase after the first switching transition. Herein we describe a novel flexible terpyridine MOF which, upon desolvation, transforms into a nonporous structure that reopens into a shape-memory phase when exposed to CO2 at 195 K. Based on comprehensive in situ experimental studies (SC-XRD and PXRD) and DFT energetic considerations combined with literature reports, we recommend dividing shape-memory MOFs into two categories, viz responsive and nonresponsive, depending on the transformability of the gas-free reopened pore phase into the collapsed phase. Furthermore, considering the methodological gap in discovering and understanding shape-memory porous materials, we emphasize the importance of multicycle physisorption experiments for dynamic open framework materials, including metal-organic and covalent organic frameworks.


Original languageEnglish
Pages (from-to)1256-1260
Number of pages5
JournalACS materials letters
Issue number4
Publication statusPublished - 3 Apr 2023

External IDs

WOS 000959620200001
PubMed 37034385