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Access to divalent lanthanide NHC complexes by redox-transmetallation from silver and CO₂ insertion reactions
- Simler, Thomas, Feuerstein, Thomas J., Yadav, Ravi, Gamer, Michael T., Roesky, Peter W.
- Chemical communications 2018 v.55 no.2 pp. 222-225
- carbenes, carbon dioxide, heterocyclic nitrogen compounds, oxidation, photoluminescence, silver
- Through a redox-transmetallation procedure, divalent NHC–Lnᴵᴵ (NHC = N-heterocyclic carbene; Ln = Eu, Yb) complexes were obtained from the corresponding NHC–AgI. The lability of the NHC–Lnᴵᴵ bond was investigated and treatment with CO₂ led to insertion reactions without oxidation of the metal centre. The Euᴵᴵ complex [EuI₂(IMes)(THF)₃] (IMes = 1,3-dimesitylimidazol-2-ylidene) exhibits photoluminescence with a quantum yield reaching 53%.