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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
Published on: June 23, 2023
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Coordination Adaptable Networks: Zirconium(IV) Carboxylates.
Meenu Murali1, Dimitri Berne2, Christine Joly-Duhamel2
1CNRS, LCC (Laboratoire de Chimie de Coordination), UPS, INPT, Université de Toulouse, 205 route de Narbonne, 31077, Toulouse, Cedex 4, France.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 26, 2022
Summary
New coordination adaptable networks (CooANs) exhibit vitrimer-like properties, enabling reshaping through thermally activated ligand exchange. These materials show tunable flow properties based on Zr6 cluster content.
Area of Science:
- Polymer Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Vitrimers are covalent adaptable networks (CANs) exhibiting unique flow properties driven by reversible chemical bonds.
- Metal-organic frameworks (MOFs) offer tunable structures and properties through metal-ligand coordination.
Purpose of the Study:
- To introduce and characterize coordination adaptable networks (CooANs) based on Zr6 clusters.
- To investigate the vitrimer-like behavior and reshaping capabilities of these novel materials.
Main Methods:
- Synthesis of Zr-CooAN-x materials with varying Zr6 cluster loadings.
- Mechanical and rheological testing to evaluate network properties and flow behavior.
- Hot-pressing experiments to assess reshaping efficiency and property retention.
Main Results:
- Zr-CooAN-x materials up to 50% Zr6 loading demonstrate vitrimer-like characteristics.
- Crosslink migration occurs via carboxylate ligand exchange, with slower relaxation at higher Zr6 content.
- Materials undergo rapid reshaping within 30 minutes at 50-100°C without significant property degradation.
Conclusions:
- Coordination adaptable networks offer a new class of materials with tunable vitrimer-like properties.
- The Zr6 clusters act as dynamic crosslinking points, enabling efficient reshaping.
- These findings open avenues for developing recyclable and reconfigurable polymer networks.
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