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Amine-elimination gave the two uranium–rhenium complexes [(TsXy)(THF)nURe(η5-C5H5)2] [TsXy = HC(SiMe2N-3,5-Me2C6H3)3; n = 0 or 1]; structural and theoretical analyses, and comparison to [(TrenTMS)URe(η5-C5H5)2] [TrenTMS = N(CH2CH2NSiMe3)3], reveal an increasing σ-component to the U–Re bond upon removal of dative ancillary ligands from uranium with the π-component remaining essentially invariant.

Graphical abstract: Structural and theoretical insights into the perturbation of uranium–rhenium bonds by dative Lewis base ancillary ligands

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