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.
J Am Chem Soc. 2015 Feb 18;137(6):2179-82. doi: 10.1021/ja512179x. Epub 2015 Feb 4.
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.
石墨相聚合氮化碳 (GPPCN) 作为一种很有前途的无金属材料，在光电器件和（光）催化领域得到了广泛的研究。然而，GPPCN 的不溶性仍然是其潜在应用的最大障碍之一。本文首次报道了 GPPCN 可以溶解在浓硫酸中，这是迄今为止第一个可行的溶剂，这是由于协同质子化和插层作用。浓度高达 300mg/mL，比以前报道的分散体高数千倍。结果，首次获得了 GPPCN 的成功液态 NMR 谱，这为揭示 GPPCN 的精细结构提供了更可行的方法。此外，在高浓度下，首次观察到了碳氮家族的液晶相。GPPCN 的成功溶解和各向异性介相的形成将极大地推动基于 GPPCN 的纳米复合材料或宏观、有序材料的组装等潜在应用。
