A comparison of neptunyl(V) and neptunyl(VI) solution coordination: the stability of cation-cation interactions.
A comparison of neptunyl(V) and neptunyl(VI) solution coordination: the stability of cation-cation interactions.
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DOI：
10.1021/ic702478w
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发表时间：
2008-05
影响因子：
4.6
通讯作者：
S. Skanthakumar;M. Antonio;L. Soderholm
中科院分区：
文献类型：
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作者：
S. Skanthakumar;M. Antonio;L. Soderholm
利用高能x射线散射研究了五价和六价Np的溶液配位环境。Np5+和Np6+均以海王星基部分的形式存在，与5个赤道水域的Np-O距离分别为2.46(2)和2.37(2)A。NpO2（2+）在4.37(3)a处也有6-10个配位球，NpO2+的散射由于Np-Np阳离子相互作用在4.2 a处散射的存在而变得复杂。通过分析该峰强度随Np浓度的变化，确定了二聚体配合物的稳定常数Keq=0.74(9) M（-1）。
The solution coordination environments of pentavalent and hexavalent Np are studied by high-energy X-ray scattering. Np5+ and Np6+ both exist as the neptunyl moiety coordinated with five equatorial waters at Np-O distances of 2.46(2) and 2.37(2) A, respectively. NpO2(2+) also has a second coordination sphere of 6-10 waters at 4.37(3) A. The NpO2+ scattering is complicated by the presence of scattering at about 4.2 A that is attributed to Np-Np cation-cation interactions. The analysis of changing intensity of this peak as a function of Np concentration is used to determine a stability constant of Keq=0.74(9) M(-1) for the dimeric complex.