Activation of molecular oxygen by a cobalt(II) tetra‐NHC complex

Schlagintweit, Jonas F., Altmann, Philipp J., Böth, Alexander D., Hofmann, Benjamin J. ORCID:, Jandl, Christian, Kaußler, Clemens, Nguyen, Linda, Reich, Robert M., Pöthig, Alexander and Kühn, Fritz E. (2021) Activation of molecular oxygen by a cobalt(II) tetra‐NHC complex. Chemistry – A European Journal, 27 (4). pp. 1311-1315. ISSN 1521-3765

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The first dicobalt(III) μ2-peroxo N-heterocyclic carbene (NHC) complex is reported. It can be quantitatively generated from a cobalt(II) compound bearing a 16-membered macrocyclic tetra-NHC ligand via facile activation of dioxygen from air at ambient conditions. The reaction proceeds via an end-on superoxo intermediate as demonstrated by EPR studies and DFT. The peroxo moiety can be cleaved upon addition of acetic acid, yielding the corresponding CoIII acetate complex going along with H2O2 formation. In contrast, both CoII and CoIII complexes are also studied as catalysts to utilize air for olefin and alkane oxidation reactions; however, not resulting in product formation. The observations are rationalized by DFT-calculations, suggesting a nucleophilic nature of the dicobalt(III) μ2-peroxo complex. All isolated compounds are characterized by NMR, ESI-MS, elemental analysis, EPR and SC-XRD.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
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Depositing User: LivePure Connector
Date Deposited: 17 Jul 2021 00:12
Last Modified: 23 Oct 2022 02:41
DOI: 10.1002/chem.202004758

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