2026-10-07T05:00:28Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33183626 2026-10-02T00:10:11Z category_25111 category_25129 category_25108 portal_918 item_type_3 month_year_10_2026

<b>A Crystalline </b><b>Uranium Fischer-Type Carbyne</b> John Seed (22289329) Jhen-Kuei Yu (2882822) Florian Meurer (1529350) Adam Brookfield (14438892) Floriana Tuna (5732659) Ashley J. Wooles (9181151) Michael Bodensteiner (653548) Max M. Hansmann (1264059) Stephen T. Liddle (9181156) F-block chemistry Organometallic chemistry Crystallography Uranium Carbyne Fischer Carbyne Complexes Actinide chemistry Quantum crystallography aminocarbyne metal-carbon triple bond Uranium-carbon Triple bond <p dir="ltr">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(m-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 s donation, weak two-electron C-->U p-donations, and two orthogonal one-electron U-->C p-back-bonds, demonstrating s²p¹p¹ Fischer-type carbyne bonding overall. This work redefines the range of bonding modes for the diazomethanediide ligand and provides a uranium-carbon triple bond interaction that is related, yet distinct, to transition metal Fischer carbynes, providing a basis to develop and understand f-element carbyne chemistry.</p> 2026-10-02T00:10:11Z Dataset Dataset 10.48420/33183626.v1 https://figshare.com/articles/dataset/_b_A_Crystalline_b_b_Uranium_Fischer-Type_Carbyne_b_/33183626 CC BY 4.0