“…High actinide halide BDEs, BDE[An–X] (An = U, Np, Pu; X = F, Cl, Br), have been demonstrated by the ability of bare An + ions to abstract halogens from halogenated hydrocarbons. , A particular area of interest is complexes that comprise the actinyls, AnO 2 2+ , bound to one or more halide: AnO 2 X n (2‑ n )+ . ,− One motivation for studying such simple complexes is that the effective electron donation of halides to the actinide metal center affects the axial actinide-oxygen bonds, generally weakening them. − Uranyls, both U VI (unless otherwise specified the oxidation states hereafter are An VI ) and U V , have been shown to form various halide complexes in condensed and gas phases, , including as representative examples UO 2 X 3 – (X = F, Cl, Br, I), ,, UO 2 F n (2‑ n )+ ( n = 1–4), − UO 2 Br 4 2– , U V O 2 X (X = Cl, I), and UO 2 X 2 (X = Cl, Br) . It has been established that the complexation affinities of uranyl by halides decreases in the order F – > Cl – > Br – . The reported synthesis of neptunyl and plutonyl halide complexes is substantially more limited and has focused primarily on the more highly Lewis basic fluoride and chloride ligands. , Among the reported neptunyl halide complexes are NpO 2 F 2 , − Np V O 2 F, , Np V O 2 F 2 – , and NpO 2 Cl 4 2– .…”