ChemInform Abstract: Crystal Structure and Electron Absorption Spectra of Neptunoyl Nitrate (NpO2)2(NO3)2×5 H2O.

Abstract

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Use of vibrational spectroscopy to identify the formation of neptunyl–neptunyl interactions: a paired density functional theory and Raman spectroscopy study

“…51 This also supports our assignment of the two bands at 716 cm −1 and 721 cm −1 to two unique nitrate modes associated with NaNO 3 and a neptunyl nitrate species. The other major phase that was identified within the diffractogram is (NpO 2 ) 2 (NO 3 ) 2 (H 2 O) 5 , which was previously characterized by Grigor'ev et al 52 The system contains two crystallographically unique Np(V) cations that link through AAIs to form a 1-D chain structure (Fig. 6a).…”

Crystallization of colourless hexanitratoneptunate(iv) with anhydrous H+ countercations trapped in a hydrogen bonded polymer with diamide linkers

“…2 Among the various oxidation numbers available for actinide elements relevant to nuclear fuel recycling, the tetravalent state, An(IV), is highly important especially in terms of Pu 4+ separation by solvent extraction with tri-n-butyl phosphate (TBP). The limiting An 4+ complexes with NO 3 À are [An(NO 3 ) 6 ] 2À (An ¼ Th, [3][4][5][6][7] U, 8,9 Np, 10,11 Pu 12-14 ), which usually crystallize with various countercations having relatively low hydration enthalpy like heavy alkali metals and quaternary ammonium ions (NR 4 + , R ¼ H, alkyl). 15 To our best knowledge, all the reported compounds of An(IV) usually exhibit original colours dened by their respective 5f electronic congurations.…”

Neptunium(vi) chain and neptunium(vi/v) mixed valence cluster complexes

“…In addition, it would be interesting to see if a pure neptunyl(V) chloride complex could be crystallized from thf solution, and if 'cationcation interactions would result in the formation of infinite chains or sheets-as observed in the analogous aqueous systems. 19,20 The UCL team is grateful to the EPSRC for a project studentship to L.J.L.H. (Grant GR/S95169/01) and for computing resources under Grant GR/S06233/01.…”