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

Kornel Roztocki1, Wiktoria Gromelska1, Filip Formalik2,3

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This study introduces a novel flexible metal-organic framework (MOF) exhibiting shape-memory properties. Upon CO2 exposure, the MOF reopens its pores, demonstrating a switchable framework behavior for advanced material applications.

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Shape-memory materials, including polymers and alloys, recover their original form after deformation via external stimuli.
  • In metal-organic frameworks (MOFs), shape-memory refers to a switchable framework's ability to retain its reopened pore structure after initial transformation.

Purpose of the Study:

  • To describe a novel flexible terpyridine MOF with shape-memory characteristics.
  • To categorize shape-memory MOFs based on the transformability of their gas-free reopened pore phase.
  • To highlight the importance of multicycle physisorption for studying dynamic porous materials.

Main Methods:

  • Synthesis of a novel flexible terpyridine MOF.
  • In situ experimental studies including Single-Crystal X-ray Diffraction (SC-XRD) and Powder X-ray Diffraction (PXRD).
  • Density Functional Theory (DFT) energetic calculations and literature review.

Main Results:

  • A novel flexible terpyridine MOF was synthesized, which transforms into a nonporous structure upon desolvation.
  • This MOF reopens into a shape-memory phase when exposed to CO2 at 195 K.
  • A classification of shape-memory MOFs into responsive and nonresponsive categories was proposed based on framework transformability.

Conclusions:

  • The study presents a new MOF exhibiting CO2-triggered shape-memory behavior.
  • A framework for classifying shape-memory MOFs is proposed, aiding in material discovery.
  • Multicycle physisorption is crucial for understanding dynamic porous materials like MOFs and COFs.