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Microtubular Self-Assembly of Covalent Organic Frameworks
, Vladimir Stepanenko, Sabrina Rager, Matthias Gr{\"{u}}ne, Dana Medina D., Thomas Bein, Frank W{\"{u}}rthner, Florian Beuerle
Published in
Volume: 57
Issue: 3
Pages: 846 - 850
Despite significant progress in the synthesis of covalent organic frameworks (COFs), reports on the precise construction of template-free nano- and microstructures of such materials have been rare. In the quest for dye-containing porous materials, a novel conjugated framework DPP-TAPP-COF with an enhanced absorption capability up to $\lambda$=800 nm has been synthesized by utilizing reversible imine condensations between 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP) and a diketopyrrolopyrrole (DPP) dialdehyde derivative. Surprisingly, the obtained COF exhibited spontaneous aggregation into hollow microtubular assemblies with outer and inner tube diameters of around 300 and 90 nm, respectively. A detailed mechanistic investigation revealed the time-dependent transformation of initial sheet-like agglomerates into the tubular microstructures.
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