| Autor: |
Lippens, P. -E., Jumas, J. -C., Génin, J. -M. R., Kawasaki, Takeshi, Kitazawa, Takafumi, Nishimura, Tatsuru, Nakada, Masami, Saeki, Masakatsu |
| Zdroj: |
ICAME 2005; 2007, p417-423, 7p |
| Abstrakt: |
We now report the 237Np Mössbauer spectra for [NpO2(acac)2py] I. The neptunium(VI) ion in I is coordinated by six oxygen atoms and the one nitrogen atom of pyridine. The isomer shift value obtained for I is −40 mm/s, which falls in the range for the Np(VI) oxidation state. The relationship between the isomer shift and Np-O bond distance of the neptunyl group for oxygen coordination compounds is in good agreement with the reported structure of I. It is well known that the mean Np-O bond distance of the neptunium compounds is shorter by 0.01 Å than that of analogous uranium compounds. The good agreement in the 237Np-Mössbauer parameters and the Np-O distance has indicated that the reported analogous [UO2(acac)2py] structure may have some inaccuracies. Therefore, we have redetermined the crystal structure of [UO2(acac)2py]. The U-O bond distance we have obtained is reasonable. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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