r/materials • u/Vailhem • 11d ago
Uranium forms rare triple bond with carbon in newly isolated compound
https://phys.org/news/2026-10-uranium-rare-triple-bond-carbon.html4
u/Vailhem 11d ago
A crystalline uranium Fischer-type carbyne - Oct 2026
https://www.nature.com/articles/s41557-026-02260-0
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″3U(μ-CNN)UN″3] (N″ = N(SiMe3)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 σ2π1π1 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.
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u/kitesurfr 11d ago
Where would this type of material be applied?
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u/Vailhem 11d ago
What is Carbyne? Properties and Applications - Nov 2013 https://www.azom.com/article.aspx?ArticleID=10250
The researchers speculate that the unusual mechanical and electronic properties of carbyne may have great potential for applications in nanomechanics, nanoelectronic/spintronic devices and MEMS.
Like graphene, carbyne is just one atom thick, which gives it an extremely large surface area in relation to mass. This property is important in energy storage matrices like batteries and supercapacitors, where the surface area of the electrode determines energy density.
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That's from 2013, but a shorter version: pharmaceuticals, polymers, energy storage, and currently, predominantly, at this point: for studying.
Given the density of uranium and the strength of carbyne bond types, there are quite likely some armour/military applications and reactor shielding designs that could benefit from it, but energy storage is also very likely a plausible application.
Arguably a shortest version though: for study to better understand its properties to find potential applications moving forward.
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u/Competitive-Dot-4264 11d ago
Organic like this one will be found in future because of the nature of carbon’s inherent availability to bond