One-Dimensional Conjugated Carbon Nitrides: Synthesis and Structure Determination by HRTEM and Solid-State NMR
Fangyan Liu, Tong Yan, Cai‐Fu Li, Xiaolong Liu
Abstract
Two-dimensional (2D) graphitic carbon nitrides (g-C 3 N 4 ) 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 1 H 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-C 3 N 4 . 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.