journal article·2023-04-03Open access

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

Kornel Roztocki, Wiktoria Gromelska, Filip Formalik, Alessia Giordana, Luca Andreo, Ghodrat Mahmoudi, Volodymyr Bon, Stefan Kaskel, Leonard J. Barbour, Agnieszka Janiak, Emanuele Priola

ACS Materials Letters· Volume 5· Issue 4

Abstract

High Resolution Image Download MS PowerPoint Slide 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 CO 2 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.
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Research context

OpenAlex topics: Metal-Organic Frameworks: Synthesis and Applications · Supramolecular Self-Assembly in Materials · Nanoplatforms for cancer theranostics

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Affiliations

Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland

Department of Micro, Nano, and Bioprocess Engineering, Faculty of Chemistry, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland

Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States

Dipartimento di Chimica, Università degli Studi di Torino, Via Pietro Giuria 7, 10125, Torino, Italy

Department of Chemistry, Faculty of Science, University of Maragheh, P.O. Box 55136-83111, Maragheh 83111-55181, Iran

Chair of Inorganic Chemistry, Technische Universität Dresden, Bergstrasse 66, 01062 Dresden, Germany

Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa

Funding

Narodowa Agencja Wymiany Akademickiej · Bundesministerium f?r Bildung und Forschung · Narodowe Centrum Nauki · Deutsche Forschungsgemeinschaft · Iran Science Elites Federation · H2020 European Research Council · National Research Foundation

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