共轭体系
氮化碳
拉曼光谱
傅里叶变换红外光谱
光化学
化学
质子核磁共振
光催化
互变异构体
氮化物
共振(粒子物理)
石墨氮化碳
材料科学
聚合物
化学工程
有机化学
催化作用
原子物理学
工程类
物理
光学
图层(电子)
作者
Fangyan Liu,Tong Yan,Caifu Li,Xiaolong Liu
标识
DOI:10.1021/acs.jpclett.1c02994
摘要
Two-dimensional (2D) graphitic carbon nitrides (g-C3N4) have sparked much interest as photocatalysts. However, they suffer from high activation energy and a low separation rate of photoexcited charge carriers. Here we report a viable strategy to craft one-dimensional carbon nitrides denoted as polymelem (PM). Our PM possesses NH-bridged and the N-bridged tautomers, both of which are π-conjugated polymers based on aromatic tri-s-triazine units, as revealed by solid-state nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), and Raman techniques. A 2D 1H double-quantum-single-quantum (DQ-SQ) NMR spectrum illustrates that the 2D architecture of PM is constructed by the formation of interchain N-H···N hydrogen bonds between different 1D PM chains. PM exhibits largely improved photocatalytic efficiency compared to g-C3N4. This can be attributed to the conjugated structures of PM, which are conducive to the decrease in activation energy and separation rate of photogenerated charge carriers.
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