Issue 14, 2022

Synthesis, structure, and electrochemical properties of [LNi(Rf)(C4F8)] and [LNi(Rf)3] complexes

Abstract

The new anionic nickelate complexes [(MeCN)Ni(C4F8)(CF3)], [(MeCN)Ni(C4F8)(C2F5)], [(IMes)Ni(C4F8)(CF3)], [(IMes)Ni(CF3)3] (IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene), and [(F-NHC)Ni(Rf)3] (F-NHC = 1,3-bis(2,4-F2Ph), 2,4,6-F3Ph- or 3,4,5-F3Ph)imidazol-2-ylidene; (Rf = CF3 or C2F5) were synthesized and structurally characterized. The electrochemical properties of all new compounds were revealed by cyclic voltammetry studies and compared to the known CF3 analogue [(MeCN)Ni(CF3)3]. The IMes-coordinated complexes exhibited initial oxidation events that were well-separated from a second oxidation process in the cyclic voltammograms. The complexes containing F-substituted NHC ligands [(F-NHC)Ni(CF3)3] are structurally quite similar to the IMes derivative and reveal also two separated oxidation waves in their cyclic voltammograms. The absolute potentials as well as the separation between the two waves vary with the substitution pattern, suggesting that the NHC ligand environment (NHC = N-heterocyclic carbene) is an interesting platform for the development of new redox-triggered reactions that release trifluoromethyl and perfluoroalkyl radicals upon oxidation.

Graphical abstract: Synthesis, structure, and electrochemical properties of [LNi(Rf)(C4F8)]− and [LNi(Rf)3]− complexes

Supplementary files

Article information

Article type
Paper
Submitted
17 2 2022
Accepted
09 3 2022
First published
17 3 2022

Dalton Trans., 2022,51, 5515-5523

Author version available

Synthesis, structure, and electrochemical properties of [LNi(Rf)(C4F8)] and [LNi(Rf)3] complexes

S. T. Shreiber, F. Amin, S. A. Schäfer, R. E. Cramer, A. Klein and D. A. Vicic, Dalton Trans., 2022, 51, 5515 DOI: 10.1039/D2DT00511E

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