Imido Complex Reactivity in Transition Metal Chemistry
Summary
Imido complexes, comprising a transition metal bound to a doubly bonded NR moiety, occupy a central role in modern organometallic chemistry. Their unique M–N multiple bonds confer diverse reactivity patterns including cycloaddition, nitrene transfer, C–H bond activation and small-molecule functionalisation. The imido ligand acts both as a π-donor and a redox-active component, modulating metal spin state and facilitating proton-coupled electron-transfer pathways. Advances in ligand design have enabled stabilisation of low-coordinate early-metal imido species as well as high-valent late-metal analogues, extending the scope from fundamental bonding studies to catalytic nitrene transfer in organic synthesis and nitrogen-fixation strategies. Detailed mechanistic elucidation draws upon X-ray crystallography, spectroscopic metrics and computational analysis to map energy profiles, spin-crossing events and metal–ligand cooperativity. The global significance of imido complexes lies in sustainable routes to amines, aziridines and ammonia under mild conditions, supporting green-chemistry objectives and informing the design of next-generation catalysts for nitrogen-cycle transformations.
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Imido Complex Reactivity in Transition Metal Chemistry publication trend
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Technical terms
Imido ligand: A dianionic NR²– unit forming a metal–nitrogen multiple bond, often responsible for π-donor interactions and nitrene-transfer reactivity.
Nitrene transfer: The transfer of an NR fragment from a metal complex to an organic substrate, enabling C–H amination or aziridination reactions.
Comproportionation: A redox process in which two metal species of different oxidation states react to yield a product with an intermediate oxidation state.
β-Diketiminate ligand: A bidentate ligand featuring an N,C,N skeleton that stabilises reactive metal centres through strong σ-donation and steric protection.
π-Donation: The donation of electron density from a filled ligand orbital into an empty metal d-orbital, strengthening metal–ligand multiple bonds.
References
- A Versatile Comproportionation Route to Construct Mono‐Imido Trichlorido Complexes of Molybdenum(V) and Tungsten(V). Zeitschrift für anorganische und allgemeine Chemie (2024).
- Expanding the Utility of β‑Diketiminate Ligands in Heavy Group VI Chemistry of Molybdenum and Tungsten. Organometallics (2023).
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