Abstract
Pure NpF 5 is precipitated from solutions of the alkali metal salts, MNpF 6, in liquid anhydrous hydrogen fluoride by acid-base displacement reaction with BF 3 ▪ NpF 5 has the αUF 5 structure. It decomposes rapidly only above 280°C to give NpF 6 and NpF 4. On hydrolysis in 1 M HC10 4 it disproportionates to give NpF 4 and NpO ++ 2. Characteristic optical spectra of the pure compound and the salts derived from it are given.
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