Covalent triazine frameworks (CTFs), belonging to the super-family of covalent organic frameworks, have attracted significant attention as a new type of photosensitizer due to the superb light-harvesting ability and efficient charge transfer originating from the large surface area. However, the wide optical band gap in CTFs, which is larger than 3.0 eV, hinders the efficient light harvesting in the visible range. To overcome this limitation, we developed the new type CTFs photocatalyst based on the donor–acceptor conjugation scheme by using melamine (M) and 2,6-diaminoanthraquinone (AQ) as monomeric units. The melamine-2,6-diaminoanthraquinone-based covalent triazine frameworks (M-AQ-CTFs) photocatalyst shows the excellent light-harvesting capacity with high molar extinction coefficient, and the suitable optical band gap involving the internal charge transfer character. Combination of M-AQ-CTFs and artificial photosynthetic system including the organometallic rhodium complex, acting as an electron mediator, exhibited the excellent photocatalytic efficiency for the regeneration of the nicotinamide cofactors such as NAD(P)H. In addition, this photocatalyst showed the high photocatalytic efficiency for the metal-free aerobic oxidation of sulfide. This study demonstrates the high potential of CTFs photocatalyst with the donor–acceptor conjugated scheme can be actively used for artificial photosynthesis.

中文翻译：

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共价三嗪骨架作为 NAD(P)H 再生和有机硫化物选择性氧化的高效光催化剂

共价三嗪骨架（CTFs）属于共价有机骨架超家族，由于其优异的光捕获能力和源自大表面积的高效电荷转移，作为一种新型光敏剂引起了人们的广泛关注。然而，CTF 中大于 3.0 eV 的宽光学带隙阻碍了可见光范围内的有效光收集。为了克服这一限制，我们使用三聚氰胺（M）和2,6-二氨基蒽醌（AQ）作为单体单元，开发了基于供体-受体共轭方案的新型CTFs光催化剂。三聚氰胺-2,6-二氨基蒽醌基共价三嗪骨架（M-AQ-CTFs）光催化剂具有优异的光捕获能力和高摩尔消光系数，以及涉及内部电荷转移特性的合适光学带隙。M-AQ-CTFs 与人工光合系统（包括作为电子介质的有机金属铑络合物）的结合，对 NAD(P)H 等烟酰胺辅助因子的再生具有优异的光催化效率。此外，该光催化剂对硫化物的无金属好氧氧化表现出高光催化效率。该研究证明了具有供体-受体共轭方案的CTFs光催化剂的高潜力可积极用于人工光合作用。对烟酰胺辅助因子如 NAD(P)H 的再生表现出优异的光催化效率。此外，该光催化剂对硫化物的无金属好氧氧化表现出高光催化效率。该研究证明了具有供体-受体共轭方案的CTFs光催化剂的高潜力可积极用于人工光合作用。对烟酰胺辅助因子如 NAD(P)H 的再生表现出优异的光催化效率。此外，该光催化剂对硫化物的无金属好氧氧化表现出高光催化效率。该研究证明了具有供体-受体共轭方案的CTFs光催化剂的高潜力可积极用于人工光合作用。