State Key Laboratory of Coordination Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China.
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China.
Chemistry. 2023 Jun 19;29(34):e202301048. doi: 10.1002/chem.202301048. Epub 2023 May 2.
Tetrathiafulvalene (TTF) and Ni-bis(dithiolene) are typical conductive units widely studied in electronics, optics, and photochemistry. However, their applications in near-infrared (NIR) photothermal conversion are often limited by insufficient NIR absorption and low chemical/thermal stability. Herein, we integrate TTF and Ni-bis(dithiolene) into a covalent organic framework (COF) with stable and efficient NIR and solar photothermal conversion performance. Two isostructural COFs, namely Ni-TTF and TTF-TTF, are successfully isolated which are composed of TTF and Ni-bis(dithiolene) units as donor-acceptor (D-A) pairs or TTF units only. Both COFs show high BET surface areas and good chemical/thermal stability. Notably, compared with TTF-TTF, the periodic D-A arrangement in Ni-TTF significantly lowers the bandgap, leading to unprecedented NIR and solar photothermal conversion performance.
四硫富瓦烯（TTF）和 Ni-双（二硫烯）是电子学、光学和光化学中广泛研究的典型导电单元。然而，它们在近红外（NIR）光热转换中的应用通常受到 NIR 吸收不足和化学/热稳定性低的限制。在此，我们将 TTF 和 Ni-双（二硫烯）整合到具有稳定和高效 NIR 和太阳能光热转换性能的共价有机骨架（COF）中。成功分离出两种同构的 COF，即 Ni-TTF 和 TTF-TTF，它们由 TTF 和 Ni-双（二硫烯）单元作为供体-受体（D-A）对或仅 TTF 单元组成。这两种 COF 都具有高 BET 表面积和良好的化学/热稳定性。值得注意的是，与 TTF-TTF 相比，Ni-TTF 中的周期性 D-A 排列显著降低了带隙，从而产生了前所未有的 NIR 和太阳能光热转换性能。
