Issue 7, 2021

Electron transfer within β-diketiminato nickel bromide and cobaltocene redox couples activating CO2

Abstract

Reduction of β-diketiminato nickel(II) complexes (LtBuNiII) to the corresponding nickel(I) compounds does not require alkali metal compounds but can also be performed with the milder cobaltocenes. LtBuNiBr and Cp2Co have rather similar redox potentials, so that the equilibrium with the corresponding electron transfer compound [LtBuNiIBr][Cp2CoIII] (ETC) clearly lies on the side of the starting materials. Still, the ETC portion can be used to activate CO2 yielding a mononuclear nickel(II) carbonate complex and ETC can be isolated almost quantitatively from the solutions through crystallisation. The more negative reduction potential of Cp*2Co shifts the equilibrium formed with LtBuNiBr strongly towards the ETC and accordingly the reaction of such solutions with CO2 is much faster.

Graphical abstract: Electron transfer within β-diketiminato nickel bromide and cobaltocene redox couples activating CO2

Supplementary files

Article information

Article type
Communication
Submitted
20 10 2020
Accepted
16 12 2020
First published
16 12 2020
This article is Open Access
Creative Commons BY-NC license

Chem. Commun., 2021,57, 875-878

Electron transfer within β-diketiminato nickel bromide and cobaltocene redox couples activating CO2

P. Zimmermann, A. F. R. Kilpatrick, D. Ar, S. Demeshko, B. Cula and C. Limberg, Chem. Commun., 2021, 57, 875 DOI: 10.1039/D0CC06983C

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