Synthesis and Small Molecule Reactivity of Uranium(IV) Alkoxide Complexes with both Bound and Pendant N-heterocyclic Carbene Ligands
✍ Scribed by Polly L. Arnold; Alexander J. Blake; Claire Wilson
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 123 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0947-6539
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✦ Synopsis
Abstract
The syntheses of two tetravalent uranium alkoxide‐carbene complexes are reported, [UIL~3~], and [UL~4~] where L=OCMe~2~CH~2~[1‐C(NCHCHN__i__Pr)]. The latter shows dynamic behaviour of the alkoxycarbene ligands in solution at room temperature, and the crystal structure of [UL~4~] shows that one carbene group remains uncoordinated. The unbound N‐heterocyclic carbene group is trapped by a range of reagents such as 16‐valence‐electron metal carbonyl fragments and BH~3~ moieties, forming, for example, [UL~3~(μ‐L)W(CO)~5~], [UL~2~(μ‐L)~2~Mo(CO)~4~], and [UL~n~(L‐BH~3~)~4−n~] (n=1–4), demonstrating the potential for these hemilabile electropositive metal–carbene complexes to participate in the bifunctional activation of small molecules.