RT Journal Article SR Electronic T1 Metal-free activation of molecular oxygen by covalent triazine frameworks for selective aerobic oxidation JF Science Advances JO Sci Adv FD American Association for the Advancement of Science SP eaaz2310 DO 10.1126/sciadv.aaz2310 VO 6 IS 14 A1 Abednatanzi, Sara A1 Gohari Derakhshandeh, Parviz A1 Leus, Karen A1 Vrielinck, Henk A1 Callens, Freddy A1 Schmidt, Johannes A1 Savateev, Aleksandr A1 Van Der Voort, Pascal YR 2020 UL http://advances.sciencemag.org/content/6/14/eaaz2310.abstract AB Oxygen activation is a critical step in ubiquitous heterogeneous oxidative processes, most prominently in catalysis, electrolysis, and pharmaceutical applications. We present here our findings on metal-free O2 activation on covalent triazine frameworks (CTFs) as an important class of N-rich materials. The O2 activation process was studied for the formation of aldehydes, ketones and imines. A detailed mechanistic study of O2 activation and the role of nitrogen heteroatoms were comprehensively investigated. The electron paramagnetic resonance (EPR) and control experiments provide strong evidence for the reaction mechanism proving the applicability of the CTFs to activate oxygen into superoxide species. This report highlights the importance of a self-templating procedure to introduce N functionalities for the development of metal-free catalytic materials. The presented findings reveal an important step toward the use of CTFs as inexpensive and high-performance alternatives to metal-based materials not only for catalysis but also for biorelated applications dealing with O2 activation.