title: Dissolution and liquid crystals phase of 2D polymeric carbon nitride.
abstract: Graphite-phase polymeric carbon nitride (GPPCN) has emerged as a promising metal-free material toward optoelectronics and (photo)catalysis. However, the insolubility of GPPCN remains one of the biggest impediments toward its potential applications. Herein, we report that GPPCN could be dissolved in concentrated sulfuric acid, the first feasible solvent so far, due to the synergistic protonation and intercalation. The concentration was up to 300 mg/mL, thousands of time higher than previous reported dispersions. As a result, the first successful liquid-state NMR spectra of GPPCN were obtained, which provides a more feasible method to reveal the finer structure of GPPCN. Moreover, at high concentration, a liquid crystal phase for the carbon nitride family was first observed. The successful dissolution of GPPCN and the formation of highly anisotropic mesophases would greatly pave the potential applications such as GPPCN-based nanocomposites or assembly of marcroscopic, ordered materials.
authors: Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, School of Chemistry and Chemical Engineering, Medical School, Southeast University , Nanjing 211189, China.
authors: Zhixin
authors: Z
authors: Zhou
authors: Jianhai
authors: J
authors: Wang
authors: Jiachao
authors: J
authors: Yu
authors: Yanfei
authors: Y
authors: Shen
authors: Ying
authors: Y
authors: Li
authors: Anran
authors: A
authors: Liu
authors: Songqin
authors: S
authors: Liu
authors: Yuanjian
authors: Y
authors: Zhang
mesh_terms: D003460:Crystallization; D009682:Magnetic Resonance Spectroscopy; D009570:Nitriles / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet
chemical_list: D009570:Nitriles; D011108:Polymers; C011206:cyanogen