A new triazine-based conjugated polymer THT-TA was constructed with simple building blocks 2,4,6-trihydrazino-1,3,5-triazine (THT) and terephthalaldehyde (TA) via solvothermal reaction. The structural characterizations confirmed the successful synthesis of the polymer, and TEM images clearly revealed the sheet-like morphology. The 2D layered structure was further confirmed by XRD, and the semi-crystalline pattern was better fitted with a novel parallelogram framework rather than classic hexagonal framework. The optical band gap of THT-TA was 2.50 eV, and the frontier orbitals were delocalized across the framework from DFT calculation, validating that higher degree of conjugation was achieved from small monomers. The photocatalytic hydrogen evolution was successfully achieved with Pt as co-catalyst and sodium ascorbate as sacrificial agent under visible light (λ > 420 nm), and the sample showed considerable stability in the long-term test for more than 200 h.

通过溶剂热反应，用简单的结构单元2,4,6-trihydrazino-1,3,5-triazine（THT）和对苯二甲醛（TA）构建了一种新的基于三嗪的共轭聚合物THT-TA。结构表征证实了聚合物的成功合成，并且TEM图像清楚地揭示了片状形态。XRD进一步证实了2D层状结构，并且半结晶模式更好地适合于新颖的平行四边形框架而不是经典的六边形框架。THT-TA的光学带隙为2.50 eV，根据DFT计算，边界轨道在整个框架内都发生了局域化，从而证明了由小单体实现了更高的共轭度。