Photophysics and Photocatalysis of Melem

  • Author: Chemistry – An Asian Journal
  • Published Date: 14 April 2018
  • Source / Publisher: Chemistry – An Asian Journal/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Photophysics and Photocatalysis of Melem

Graphitic carbon nitride (g-CN) is a potential metal-free photocatalyst. Its photocatalytic mechanism is proposed to involve its heptazine ring. Melem (1,3,4,6,7,9,9b-heptaazaphenalen-2,5,8-triamin; pictured) is the simplest heptazine-based compound. It is one of the condensation products of melamine. g-CN is the polymeric product of melem. Studies on the photophysics of melem can help researchers understand the photocatalytic mechanism of heptazine-based materials.


Rong Lu, Anchi Yu, Renmin University of China, Beijing, and colleagues have prepared melem and then gradually purified it. The researchers characterized the unpurified and purified melem using X-ray diffraction (XRD), infrared (IR) spectroscopy, elemental analysis, UV/Vis diffuse reflectance and fluorescence spectroscopy, as well as fluorescence decay lifetime measurements.


The team found that the condensation of melamine to melem causes stronger photoluminescence, whereas the condensation of melem to g‐CN causes weaker photoluminescence. In addition, a mixture of the monomer melem and its higher condensates is more easily obtained during the preparation of melem. Higher condensates of melem in the product mixture significantly affect the photophysical properties. The photocatalytic hydrogen evolution of melem has also been measured. It was found that the monomer melem has negligible photoinduced water-splitting activity.


 

Article Views: 2239

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission and consult our permission guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH