Approaching cumulative quintuple bonds in all-metal uranyl analogs

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ID: 322937
2026
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Abstract
Abstract While the progression from single (H2), double (O2), and triple (N2) bonds in diatomic molecules to the discovery of transition metal quadruple (Re–Re) and quintuple (Cr–Cr) bonds has significantly expanded our understanding of covalent interactions, the exploration of cumulative multiple bonds in trinuclear systems has remained largely unexplored. Until now, cumulative bonds beyond triple multiplicity have neither been experimentally isolated nor theoretically predicted. Here, we propose a new bonding model—cumulative quintuple bonds—and report the synthesis and characterization of a novel trinuclear species, [Co–U–Co], which exhibits bonding interactions approaching cumulative quintuple bonds. Advanced quantum chemical calculations reveal that the cumulative multiple bonds consist of one pair of U–Co σ bonds, two pairs of U–Co π bonds, one pair of U–Co δ bonds, a three-center-two-electron δ bond, and a δ hyperconjugation. This species represents the first example of an all-metal uranyl analog featuring a linear M–U–M core with cumulative multiple bonds. This discovery not only extends the theoretical boundaries of cumulative multiple bonds but also establishes a transformative precedent for cumulative bonding multiplicity in trinuclear species.
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Authors Xingxing Gong, Jiaxin Chen, Xinyu Liu, Ningxin Jiang, Jingxiang Zou, Yichi Zhang, Yue Zhao, Shuao Wang, Zhenyang Lin, Congqing Zhu
Journal national science review
Year 2026
DOI
10.1093/nsr/nwag462
URL
https://doi.org/10.1093/nsr/nwag462
Keywords Keywords not found

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