Uranium(III)-carbon multiple bonding supported by arene δ-bonding in mixed-valence hexauranium nanometre-scale rings.

The molecular orbitals in 4′ that principally represent the U = C double bond interactions exhibit variable levels of intrusion from other orbital coefficients due to their delocalised nature, but despite this from the more localised and thus clear-cut U = C molecular orbital combinations a clear trend emerges; the uranium(III)-, uranium(III/IV)-, and uranium(IV)-C BIPM bonds show uranium and carbon contributions of 14:57%, 18:40%, and 22:20%, respectively where the total uranium contribution is clearly increasing with increasing oxidation state.

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