Issue 15, 2019

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

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. While [U(OBMes2)3]2 shows no reaction with CO or CO2, [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].

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

Supplementary files

Article information

Article type
Paper
Submitted
21 dez 2018
Accepted
28 fev 2019
First published
29 mar 2019
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2019,48, 4894-4905

Applications of boroxide ligands in supporting small molecule activation by U(III) and U(IV) complexes

P. L. Arnold, L. Puig-Urrea, J. A. L. Wells, D. Yuan, F. L. Cruickshank and R. D. Young, Dalton Trans., 2019, 48, 4894 DOI: 10.1039/C8DT05051A

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