Abstract
For metal‐free, organic conjugated polymer‐based photocatalysts, synthesis of defined nanostructures is still highly challenging. Here, we report the formation of covalent triazine framework (CTF) nanoparticles via a size‐controllable confined polymerization strategy. The uniform CTF nanoparticles exhibited significantly enhanced activity in the photocatalytic formation of dibenzofurans compared to the irregular bulk material. The optoelectronic properties of the nanometer‐sized CTFs could be easily tuned by copolymerizing small amounts of benzothiadiazole into the conjugated molecular network. This optimization of electronic properties led to a further increase in observed photocatalytic efficiency, resulting in total an 18‐fold enhancement compared to the bulk material. Full recyclability of the heterogeneous photocatalysts as well as catalytic activity in dehalogenation, hydroxylation and benzoimidazole formation reactions demonstrated the utility of the designed materials.
Highlights
Promising heterogeneous polymer photocatalysts for visible light-promoted chemical transformations.[9]
As one of the few examples, our group reported on the use of silica templates to form hollow or mesoporous covalent triazine framework (CTF).[8b,14] The group of Tan and Jin was able to synthesize hollow CTF nanospheres for photocatalytic hydrogen evolution.[6b]. The study emphasizes the benefits of nanoscale features for catalytic applications as well as the crucial role of morphology control in designing efficient photoactive CTF materials
We present a confinement synthesis for sizecontrollable covalent triazine framework nanoparticles, which is inspired by the baking techniques for fine-shaped cookies
Summary
Promising heterogeneous polymer photocatalysts for visible light-promoted chemical transformations.[9]. All signals could be matched with the assumed structure, confirming the CTF synthesis from DCHT (Supporting Information, Figure S5). Thermogravimetric analysis (TGA) showed that the CTF NPs stay intact up to 400 8C, which is comparable to CTFs from previous studies and proves good thermal stability (Supporting Information, Figure S7).[14]
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