192059-69-1Relevant academic research and scientific papers
Thermally stable uranium dinitrogen complex with siloxide supporting ligands
Mansell, Stephen M.,Farnaby, Joy H.,Germeroth, Anne I.,Arnold, Polly L.
, p. 4214 - 4222 (2013/09/02)
A new dinitrogen adduct of a homoleptic uranium tris(siloxide) complex, [U{OSi(Mes)3}3]2(μ-η2: η2-N2), is reported. Synthesis of the 15N-labeled isotopomer and Raman spectroscopy confirm the reductive activation of N2 to a (N2)2- dianion. The 15N NMR shift of the 15N2-labeled isotopomer is also reported. Crystallographic characterization shows a side-on (N 2)2- coordinated in either an eclipsed or staggered conformation in different crystals. The U-N2-U complex is stable to vacuum and shows high thermal stability, retaining the formally reduced dinitrogen at 100 C. The parent three-coordinate uranium(III) [U{OSi(Mes) 3}3] could not be isolated in our hands, with N 2-free syntheses affording only uranium(IV) compounds. The rational synthesis and full characterization of two such U(IV) byproducts, [U{OSi(Mes)3}{N(SiMe3)2}3] and [U{OSi(Mes)3}4], is also reported.
