title: The Uranium(VI) Oxoazides [UO2(N3)2⋅CH3CN], [(bipy)2(UO2)2(N3)4], [(bipy)UO2(N3)3]-, [UO2(N3)4]2-, and [(UO2)2(N3)8]4.
abstract: The reaction between [UO2F2] and an excess of Me3SiN3in acetonitrile solution results in fluoride-azide exchange and the uranium(VI) dioxodiazide adduct [UO2(N3)2⋅CH3CN] was isolated in quantitative yield. The subsequent reaction of [UO2(N3)2⋅CH3CN] with 2,2'-bipyridine (bipy) resulted in the formation of the azido-bridged binuclear complex [(bipy)2(UO2)2(N3)4]. The triazido anion [(bipy)UO2(N3)3]-was obtained by the reaction of [UO2(N3)2⋅CH3CN] with stoichiometric amounts of bipy and the ionic azide [PPh4][N3]. The reaction of [UO2(N3)2] with two equivalents of the [PPh4][N3] resulted in the formation of the mononuclear tetraazido anion [UO2(N3)4]2-as well as the azido-bridged binuclear anion [(UO2)2(N3)8]4-. The novel uranium oxoazides were characterized by their vibrational spectra and in the case of [(bipy)2(UO2)2(N3)4]⋅CH3CN, [PPh4][(bipy)UO2(N3)3], [PPh4]2[UO2(N3)4], [PPh4]2[UO2(N3)4]⋅2CH3CN, and [PPh4]4[(UO2)2(N3)8]⋅4CH3CN by their X-ray crystal structures.
authors.affiliation: Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, CA, 90089-1661, USA.
authors.forename: Ralf
authors.identifier: 0000-0003-4151-3593
authors.initials: R
authors.lastname: Haiges
authors.affiliation: Department of Chemistry, The University of Alabama, Tuscaloosa, AL, 35487, USA.
authors.forename: Monica
authors.initials: M
authors.lastname: Vasiliu
authors.affiliation: Department of Chemistry, The University of Alabama, Tuscaloosa, AL, 35487, USA.
authors.forename: David A
authors.initials: DA
authors.lastname: Dixon
authors.affiliation: Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, CA, 90089-1661, USA.
authors.forename: Karl O
authors.initials: KO
authors.lastname: Christe
keywords: azides; crystal structures; polyazides; uranium; uranyl