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Ligand Field-Actuated Non-Innocence of Acetylacetonate

preprint
submitted on 31.03.2020 and posted on 01.04.2020 by Morten Gotthold Vinum, Laura Voigt, Steen Hansen, Colby Bell, Kensha Marie Clark, René Wugt Larsen, Kasper Pedersen

The quest for simple ligands to participate in concerted base metal-ligand multiple-electron redox events is driven by perspectives of replacing noble metals in catalysis and for discovering novel chemical reactivity. Yet the vast majority of simple ligand systems displays electrochemical potentials impractical for catalytic cycles substantiating the importance of new strategies towards aligned metal–ligand orbital energy levels. We herein demonstrate the possibility to establish and tame the elusive non-innocence of the ubiquitous acetylacetonate (acac), that is the most commonly employed anionic, chelating ligand towards elements across the entire Periodic Table. By employing the ligand field in the high-spin Cr(II) as a thermodynamic switch, we were able to chemically tailor the occurrence of metal–ligand redox events. The very mechanism can be understood as a destabilization of the dz2 orbital relative to the pi* LUMO of acac, which proffers a generalizable strategy to synthetically engineer non-innocence with seemingly redox-inactive ligands.

Funding

VILLUM Fonden (15374)

Carlsberg Foundation (CF-17-0637)

History

Email Address of Submitting Author

kastp@kemi.dtu.dk

Institution

Department of Chemistry, Technical University of Denmark

Country

Denmark

ORCID For Submitting Author

0000-0002-4381-4544

Declaration of Conflict of Interest

No conflict of interest

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