Thermally stable uranium dinitrogen complex with siloxide supporting ligands

Mansell, S. M., Farnaby, J. H. , Germeroth, A. I. and Arnold, P. L. (2013) Thermally stable uranium dinitrogen complex with siloxide supporting ligands. Organometallics, 32(15), pp. 4214-4222. (doi: 10.1021/om4003957)

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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 (N2)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 N2-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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Farnaby, Dr Joy
Authors: Mansell, S. M., Farnaby, J. H., Germeroth, A. I., and Arnold, P. L.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Organometallics
Publisher:American Chemical Society
ISSN (Online):1520-6041
Published Online:12 July 2013

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