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A flavin-inspired covalent organic framework for photocatalytic alcohol oxidation

Trenker, Stefan; Grunenberg, Lars; Banerjee, Tanmay; Savasci, Gökcen; Poller, Laura M.; Muggli, Katharina I. M.; Haase, Frederik; Ochsenfeld, Christian; Lotsch, Bettina V.


Covalent organic frameworks (COFs) offer a number of key properties that predestine them to be used as heterogeneous photocatalysts, including intrinsic porosity, long-range order, and light absorption. Since COFs can be constructed from a practically unlimited library of organic building blocks, these properties can be precisely tuned by choosing suitable linkers. Herein, we report the construction and use of a novel COF (FEAx-COF) photocatalyst, inspired by natural flavin cofactors. We show that the functionality of the alloxazine chromophore incorporated into the COF backbone is retained and study the effects of this heterogenization approach by comparison with similar molecular photocatalysts. We find that the integration of alloxazine chromophores into the framework significantly extends the absorption spectrum into the visible range, allowing for photocatalytic oxidation of benzylic alcohols to aldehydes even with low-energy visible light. In addition, the activity of the heterogeneous COF photocatalyst is less dependent on the chosen solvent, making it more versatile compared to molecular alloxazines. Finally, the use of oxygen as the terminal oxidant renders FEAx-COF a promising and “green” heterogeneous photocatalyst.

Verlagsausgabe §
DOI: 10.5445/IR/1000141361
Veröffentlicht am 18.12.2021
DOI: 10.1039/d1sc04143f
Zitationen: 9
Web of Science
Zitationen: 9
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2041-6520, 2041-6539
KITopen-ID: 1000141361
HGF-Programm 43.33.11 (POF IV, LK 01) Adaptive and Bioinstructive Materials Systems
Erschienen in Chemical science
Verlag Royal Society of Chemistry (RSC)
Band 12
Heft 45
Seiten 15143–15150
Nachgewiesen in Web of Science
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