Huang Wei, Huber Niklas, Jiang Shuai, Landfester Katharina, Zhang Kai A I
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Department of Materials Science, Fudan University, 200433, Shanghai, P. R. China.
Angew Chem Int Ed Engl. 2020 Oct 12;59(42):18368-18373. doi: 10.1002/anie.202007358. Epub 2020 Sep 21.
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.
对于无金属的、基于有机共轭聚合物的光催化剂而言，合成特定的纳米结构仍然极具挑战性。在此，我们报道了通过尺寸可控的受限聚合策略形成共价三嗪框架（CTF）纳米颗粒。与不规则的块状材料相比，均匀的CTF纳米颗粒在光催化形成二苯并呋喃方面表现出显著增强的活性。通过将少量苯并噻二唑共聚到共轭分子网络中，可以轻松调节纳米尺寸CTF的光电性质。这种电子性质的优化导致观察到的光催化效率进一步提高，与块状材料相比，总共提高了18倍。多相光催化剂的完全可回收性以及在脱卤、羟基化和苯并咪唑形成反应中的催化活性证明了所设计材料的实用性。
