Journal
SUSTAINABLE ENERGY & FUELS
Volume 7, Issue 8, Pages 1963-1973Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3se00020f
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Triazine is considered as a starting material for 2D covalent organic frameworks (COFs) used in photocatalysis. This study demonstrates the synthesis of two 2D beta-ketoenamine-linked COFs, TpTAPT-COF and TpTAPB-COF, by condensing 1,3,5-triformylphloroglucinol (Tp) with either 1,3,5-tris(4-aminophenyl)triazine (TAPT) or 1,3,5-tris(4-aminophenyl)benzene (TAPB) under solvothermal conditions catalyzed by an organobase. TpTAPT-COF exhibits improved crystallinity and higher stability due to triazine, and also shows better photocatalytic performance for the oxidation of organic sulfides.
Triazine could be the onset for photocatalytic materials like 2D (two-dimensional) covalent organic frameworks (COFs). 2D COFs formed by combining beta-ketoenamine bonds and triazine are expected to exhibit high photocatalytic activity. In this work, the condensations of 1,3,5-triformylphloroglucinol (Tp) and 1,3,5-tris(4-aminophenyl)triazine (TAPT) or 1,3,5-tris(4-aminophenyl)benzene (TAPB) under solvothermal conditions catalyzed by an organobase afford two 2D beta-ketoenamine-linked COFs, namely TpTAPT-COF and TpTAPB-COF. Due to triazines, TpTAPT-COF tends to form crystalline materials more efficiently than TpTAPB-COF. In addition, the closer pi-pi stacking of the planar layers of TpTAPT-COF contributes to its high stability and steady electron and energy transfer. TpTAPT-COF performs better conversions than TpTAPB-COF for photocatalytic oxidation of organic sulfides. Moreover, sulfoxides are generated in both energy and electron transfer channels during TpTAPT-COF photocatalysis. This endeavor highlights that triazine is viable for constructing 2D COFs for photocatalysis.
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