Abstract
Five neptunyl(V) compounds were synthesized and studied by237Np Mossbauer spectroscopy. The isomer shifts (δ) of the Mossbauer spectra ranged from −18.6 to −19.1 mm/s for the compounds with Np atoms surrounded by 7 oxygen atoms (coordination number (CN) 7). On the other hand, the larger value of δ was obtained for the compound with CN 8. from the comparison of the present results with those reported on neptunyl(V) and (VI) compounds, it is concluded that there is a correlation between the δ and the CN for neptunyl(V) compounds, and the distribution of δ is narrower for neptunyl(V) compounds than that of neptunyl(VI) compounds.
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