Year: 2026
Type: article
Abstract: Since their discovery in 1973, transition metal Fischer carbynes have become a foundational class of metal–carbon triple bond in organometallic chemistry. However, even though the uranium Fischer carbyne bonding motif has been a fundamental target in f -element chemistry, its isolation has remained challenging. Here we report the synthesis and characterization of the uranium Fischer-type carbyne complex [N″ 3 U(μ-CNN)UN″ 3 ] (N″ = N(SiMe 3 ) 2 ). Single-crystal X-ray diffraction analysis reveals a uranium–carbyne distance of 2.379(15) Å, and density functional theory calculations combined with experimental quantum crystallography Hirshfeld atom refinement reveal the presence of two-electron C→U σ -donation, weak two-electron C→U π -donations and two orthogonal one-electron U→C π -back-bonds, demonstrating σ 2 π 1 π 1 Fischer-type carbyne bonding overall. This work redefines the range of bonding modes for the diazomethanediide ligand and reveals a uranium–carbon triple-bond interaction that is related, yet distinct from transition metal Fischer carbynes, providing a basis to develop and understand f -element carbyne chemistry.
Source: Nature Chemistry
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $12,690
Awards: sigma-Aromatic Actinide-Actinide Bonding: A New Frontier in f-Block Chemistry, Increasing sustainability at the EPR NRF, National Nuclear User Facility at the Centre for Radiochemistry Research (CRR), Uranium-Ligand Multiple Bonds: From Molecules to Materials, G713447445, EPR NRF Core Equipment Bid, G8912375032, A National Research Facility for EPR Spectroscopy, 2022-2027
OpenAlex ID: W7204506216
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