Applications of boroxide ligands in supporting small molecule activation by U(iii) and U(iv) complexes

Polly L. Arnold, Laura Puig-urrea, Jordann A. L. Wells, Dan Yuan, Faye Cruickshank, Rowan D. Young

Research output: Contribution to journalArticlepeer-review

Abstract

The boroxide ligand [OBAr2]- (Ar = Mes, Trip) is shown to be able to support both UIII and UIV centres for the first time. The synthesis and structures of homoleptic and heteroleptic UIII and UIV complexes are reported. The UX3 complex with larger substituents, [U(OBTrip2)3]2, exhibits greater thermal stability compared to less encumbered [U(OBMes2)3]2 but reacts with a smaller range of the small molecules tested to date. Initial studies on their capacity to participate in small molecule chemistry show that dark purple [U(OBMes2)3]2 binds and/or reductively activates a variety of small molecules such as pyridine-oxide, triphenylphosphineoxide, sulfur, and dicyclohexylcarbodiimide. In contrast, [U(OBMes2)3]2 shows no reaction with CO or CO2 while [U(OBTrip2)3]2 is oxidised by both, in the former case forming U(OBTrip2)4, and in the latter case forming a small quantity of the structurally characterised μ-carbonate product (μ-CO3){U(OBTrip2)3}2.
Original languageEnglish
JournalDalton Transactions
Early online date29 Mar 2019
DOIs
Publication statusE-pub ahead of print - 29 Mar 2019

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