2d sp(2) carbon-conjugated covalent organic framework with pyrene-tethered tempo intercalation for photocatalytic aerobic oxidation of sulfides into sulfoxides
Document Type
Article
Publication Date
1-1-2022
Abstract
The 2D covalent organic frameworks (COFs) offer many 2D planes which are suitable for pi-pi stacking interactions with other conjugated molecules. To improve the photocatalytic performance of COFs, the synthesis of a pyrene-tethered 2,2,6,6-tetramethylpiperidinyl-N-oxyl (TEMPO) derivative cocatalyst is hereby described. The pyrene end of the cocatalyst is intercalated in between the layers of the 2D sp(2) carbon-conjugated porphyrin covalent organic framework (Por-sp(2)c-COF) via pi-pi stacking interactions evidenced by theoretical and experimental studies. The immobilization of pyrene-tethered TEMPO significantly enhances both the efficiency of photoinduced hole transfer and the stability of Por-sp(2)c-COF for the selective aerobic oxidation of a series of sulfides to sulfoxides under the irradiation of 623 nm red LEDs. This work highlights the merit of pi-pi stacking as a facile and efficient approach of immobilizing hole transfer cocatalysts without disrupting the physiochemical properties of the 2D COF photocatalyst.
Keywords
Covalent organic frameworks, Oxidation of sulfides, Photocatalysis, Red LEDs, Pi-pi, Stacking
Divisions
fac_eng
Funders
National Natural Science Foundation of China (NSFC)[21773173],National Natural Science Foundation of China (NSFC)[22072108]
Publication Title
Solar RRL
Volume
6
Issue
1
Publisher
Wiley-V C H Verlag GMBH
Publisher Location
POSTFACH 101161, 69451 WEINHEIM, GERMANY