4.6 Article

Photophysics and Photocatalysis of Melem: A Spectroscopic Reinvestigation

期刊

CHEMISTRY-AN ASIAN JOURNAL
卷 13, 期 8, 页码 1060-1066

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201800186

关键词

heptazines; hydrogen; photochemistry; structure-activity relationships; water splitting

资金

  1. National Natural Science Foundation of China [21773306, 21373269]

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Graphitic carbon nitride (g-CN) is one potential metal-free photocatalyst. The photocatalytic mechanism of g-CN is related to the heptazine ring building unit. Melem is the simplest heptazine-based compound and g-CN is its polymeric product. Thus, studies on the photophysical properties of melem will help to understand the photocatalytic mechanism of heptazine-based materials. Herein, the spectroscopic features of melem were systematically explored through measuring its absorption spectrum, fluorescence spectrum, and fluorescence decay. Both fluorescence spectroscopy and fluorescence decay measurements show that the condensation of melamine to melem causes stronger photoluminescence, whereas the condensation of melem to g-CN causes weaker photoluminescence. In addition, all observations reveal that a mixture of monomer melem and its higher condensates is more easily obtained during the preparation of melem, and that the higher condensates of melem affect the photophysical properties of melem dominantly. The photocatalytic hydrogen evolution of melem has also been measured and the monomer melem has negligible photoinduced water-splitting activity.

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