Terminal Cobalt Imido Complexes Bearing N-Anchored Tripodal N-Heterocyclic Carbene Ligands:From Imides to Imidyls and Nitrenes

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  • Zhang Zihan
    Department of Chemistry and Pharmacy, Friedrich-Alexander Universität of Erlangen-Nürnberg (FAU)
  • Meyer Karsten
    Department of Chemistry and Pharmacy, Friedrich-Alexander Universität of Erlangen-Nürnberg (FAU)

Abstract

<p> The use of tripodal N-Heterocyclic Carbene (NHC) ligands has enabled the synthesis of novel monomeric transition metal complexes with distinctive bonding motifs. Researchers have successfully developed isolable examples of midto high-valent, late transition metal imido species using these ligands in recent years. This concise review focuses on the contemporary synthetic approaches of terminal cobalt imido complexes that feature various nitrogen-anchored tripodal NHC ligands. The terminal cobalt imido complexes discussed in this review have exhibited several different reaction modes, including intramolecular migratory insertion, C–H bond insertion, and nucleophilic addition. Furthermore, singlecrystal X-ray diffraction analyses have revealed unique structural parameters of these complexes. To gain better insight into the electronic structures of these cobalt imido species, spectroscopic and computational studies have been conducted. These studies have provided evidence to support the cobalt imido speciesʼ imidyl radical or nitrene characters. Overall, the use of tripodal NHC ligands in the synthesis of terminal cobalt imido complexes has provided researchers with a powerful platform to explore and develop new late transition metal species with unique bonding motifs and reactivity patterns.</p>

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