Abstract
Melem tetramer, the newly synthesized carbon nitride compound is composed of oligomers with four melem units, is stable in air, and has improved optical properties compared to melon.
Highlights
Carbon nitride (CN) compounds have attracted significant attention as new photocatalysts capable of decomposing water and producing hydrogen upon irradiation using visible light
Recent studies have shown that the thermal polymerization of melamine under an inert atmosphere, typically used for the synthesis of graphitic carbon nitride (g-CN), provides melon and not g-C3N4, based on X-ray diffraction (XRD) and quantitative analysis by X-ray photoemission (XPS).[13]
melem tetramer (MT) thermally polymerizes at a temperature slightly lower than that used for the thermal polymerization of melon
Summary
G-CN has a layered structure comprising tri-s-triazine units connected through planar amino groups and exhibits excellent chemical and thermal stability, flexibility, and photoabsorption in the visible range.[6,7] These properties make g-CN suitable for use in visible-light photocatalysis to generate hydrogen. As previously described by several researchers,[11,12] most g-C3N4 samples, which is a g-CN compound with a stoichiometric ratio of C to N is 3 : 4, synthesized to date contain significant amount of hydrogen atoms, as demonstrated by amino group vibrations in the infrared spectra and other experimental evidence These reports indicate that most g-C3N4 samples prepared via thermal polymerization of the precursor, 2,4,6-triamino-1,3,5-triazine (melamine: Fig. 1), are different compounds. The optical properties of the compound are investigated, and it is determined that it possesses fluorescence properties with an absolute quantum yield of approximately twice that of melon This allows the identification of appropriate polymerization conditions for the application of the CN-based compound as a new lightemitting material
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