The Rapid Mechanochemical Synthesis of Microporous Covalent Triazine Networks: Elucidating the Role of Chlorinated Linkers by a Solvent‐Free Approach

• Published in: Advanced sustainable systems (Online) Vol. 7; no. 4
• Main Authors: Krusenbaum, Annika, Kraus, Fabien Joel Leon, Hutsch, Stefanie, Grätz, Sven, Höfler, Mark Valentin, Gutmann, Torsten, Borchardt, Lars
• Format: Journal Article
• Language: English
• Published: 01-04-2023
• Subjects: ball milling; covalent triazine networks; mechanochemistry; microporous polymers; solvent‐free synthesis; sustainable synthesis
• ISSN: 2366-7486; 2366-7486
• DOI: 10.1002/adsu.202200477

The mechanochemical synthesis of porous covalent triazine networks (CTNs), exhibiting theoretically ideal C/N ratios and high specific surface areas, is presented. Employing this solvent‐free approach allows to minimize the ecological impact of the synthesis by bypassing hazardous wastes, while simultaneously observing the reactions between the individual starting materials separately for the first time. Especially the role of dichloromethane needs to be reconsidered, functioning as a linker between the nitrogen‐containing node cyanuric chloride and the aromatic monomer 1,3,5‐triphenylbenzene, as proven by X‐ray photoelectron spectroscopy and 1H → 13C Cross‐Polarization magic‐angle‐spinning nuclear magnetic resonance spectroscopy. This results in a drastic enhancement of the reaction rate, reducing the synthesis time down to 1 minute. Additionally, this linkage over a C1 bridge enables the incorporation of nitrogen into already synthesized polymers by post polymerization functionalization. The variation of the synthesis building blocks, namely the linker, node, and monomer, results in a variety of nitrogen‐containing polymers with specific surface areas of up to 1500 m2 g−1. Therefore, the presented approach is capable to target the synthesis of various CTNs with a minimal use of chlorinated linker, rendering the concept as a sustainable alternative to the classical solution‐based synthesis.
Porous covalent triazine networks (CTNs) are generated by a solvent‐free mechanochemical synthesis approach. The special role of the nitrogen‐containing node and the halogenated linker are identified, enabling a drastic reduction of synthesis time to 1 minute. A variation of several building blocks results in numerous CTNs with specific surface areas of up to 1500 m2 g−1.