Fluoride complexation of rutherfordium (Rf, element 104)
Fluoride complexation of rutherfordium (Rf, element 104)
复制标题
钌（Rf，104 号元素）的氟化物络合
DOI：
10.1524/ract.2000.88.5.265
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发表时间：
2000
影响因子：
1.8
通讯作者：
B. Schausten
中科院分区：
文献类型：
--
作者：
E. Strub;J. Kratz;A. Kronenberg;A. Nähler;P. Thörle;S. Zauner;W. Brüchle;E. Jäger;M. Schädel;B. Schausten
用自动快速化学仪ARCA测定了阳离子交换树脂(CIX)和阴离子交换树脂(AIX)上的Kd值，研究了4族元素Zr、Hf、Rf和Th在HNO3/Hf混合溶液中的氟络合作用。在CIX上，这四种元素在10-3M HF以下以阳离子的形式强烈保留。对于Zr和Hf，在10-3MHf和10-2MHf之间，由于形成氟化物络合物而导致Kd值的降低。对于Rf和Th，在高一个数量级的HF浓度下观察到这种下降。在AIX上，对于Zr和Hf，在10-3M HF和10-2M HF之间观察到由于形成阴离子氟化物络合物而导致Kd值的上升，即在相同的HF浓度范围内，CIX上的Kd值下降，从而产生了一致的图像。对于Rf和Th，在AIX上，即使HF浓度增加到1M，Kd值也没有上升。通过改变竞争AIX树脂上结合位置的反离子NO3的浓度，可以表明Rf确实形成了阴离子氟化物络合物。显然，NO3-相对于[RfFx](x-4)-比与[ZrFy](y-4)-和[HfFz](z-4)-有更具体的竞争。
The fluoride complexation of the group-4 elements Zr, Hf and Rf, and of the pseudo-homolog Th, has been investigated in mixed HNO3/HF solutions by studying Kd values on both cation exchange resins (CIX) and anion exchange resins (AIX) using the automated rapid chemistry apparatus ARCA. On the CIX, the four elements are strongly retained as cations below 10-3 M HF. For Zr and Hf, the decrease of the Kd values due to the formation of fluoride complexes occurs between 10-3 M HF and 10-2 M HF. For Rf and Th, this decrease is observed at one order of magnitude higher HF concentrations. On the AIX, for Zr and Hf, a rise of the Kd values due to the formation of anionic fluoride complexes is observed between 10-3 M HF and 10-2 M HF, i.e. in the same range of HF concentrations where the decrease of the Kd values on the CIX is observed, yielding a consistent picture. For Rf and Th, on the AIX, no rise of the Kd values is observed even if the HF concentration is increased up to 1 M. By varying the concentration of the counter ion NO3- which is competing for the binding sites on the AIX resin, it could be shown, nevertheless, that Rf does form anionic fluoride complexes. Apparently, there is a more specific competition of NO3- with respect to [RfFx](x-4)- than with [ZrFy](y-4)- and [HfFz](z-4)-.