Abstract
The preparation of NpF 5 by reacting a solution containing NpF 6 − with the Lewis acid BF 3 in anhydrous HF is reported. The purity of NpF 5 was established by its Mössbauer spectrum, which showed only the presence of Np 5+. Thermal decomposition and some chemical reactions of NpF 5 are described. Debye-Scherrer powder data from NpF 5 appear similar to those obtained from α-UF 5, indexing as tetragonal with cell constants a = 6.5358(18) A ̊ and c = 4.4562(14) A ̊ . Photochemical irradiation of NpF 6 produced an amorphous material believed, but not confirmed, to be NpF 5.
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