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Structural and spectroscopic characterization of an einsteinium complex

机译：嗜酸盐络合物的结构和光谱表征

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The transplutonium elements (atomic numbers 95-103) are a group of metals that lie at the edge of the periodic table. As a result, the patterns and trends used to predict and control the physics and chemistry for transition metals, main-group elements and lanthanides are less applicable to transplutonium elements. Furthermore, understanding the properties of these heavy elements has been restricted by their scarcity and radioactivity. This is especially true for einsteinium (Es), the heaviest element on the periodic table that can currently be generated in quantities sufficient to enable classical macroscale studies~(1). Here we characterize a coordination complex of einsteinium, using less than 200 nanograms of~(254)Es (with half-life of 275.7(5) days), with an organic hydroxypyridinone-based chelating ligand. X-ray absorption spectroscopic and structural studies are used to determine the energy of the L_(3)-edge and a bond distance of einsteinium. Photophysical measurements show antenna sensitization of Es~(III)luminescence; they also reveal a hypsochromic shift on metal complexation, which had not previously been observed in lower-atomic-number actinide elements. These findings are indicative of an intermediate spin-orbit coupling scheme in which j-j coupling (whereby single-electron orbital angular momentum and spin are first coupled to form a total angular momentum, j) prevails over Russell-Saunders coupling. Together with previous actinide complexation studies~(2), our results highlight the need to continue studying the unusual behaviour of the actinide elements, especially those that are scarce and short-lived.
机译：转变元素（原子序数95-103）是一组位于周期表边缘的金属。结果，用于预测和控制过渡金属的物理学和化学的模式和趋势，主要基团元素和镧系元素不太适用于转蛋白元素。此外，了解这些重点的性质已经受到它们的稀缺和放射性的限制。这对于Einsteinium（ES）尤其如此，定期表上的最重的元素目前可以以足以实现古典宏观研究的数量产生〜（1）。在这里，我们的特征在于食素脂肪酸的协调络合物，使用小于200纳米〜（254）ES（具有275.7（5）天的半衰期），具有有机羟基吡啶酮基螯合配体。 X射线吸收光谱和结构研究用于确定L_（3）-Edge的能量和嗜酸酯的粘合距离。光物理测量显示ES〜（III）发光的天线敏化;他们还揭示了在低原子数致动元件中未观察到的金属络合物的低温变化。这些发现指示中间旋转轨道耦合方案，其中J-J耦合（由此单电子轨道角动量和旋转首先耦合以形成总角动量，J）占Russell-Saunders耦合。与以前的神曲线络合研究一起〜（2），我们的结果突出了继续研究神职元素的不寻常行为，特别是那些稀缺和短暂的行为的需要。

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  • 来源
    《Nature》 |2021年第7844期|85-88|共4页
  • 作者

    Korey P Carter; Katherine M Shield; Kurt F Smith; Zachary R Jones; Jennifer N Wacker; Leticia Arnedo-Sanchez; Tracy M Mattox; Liane M Moreau; Karah E Knope; Stosh A Kozimor; Corwin H Booth; Rebecca J Abergel;

  • 作者单位

    Chemical Sciences Division Lawrence Berkeley National Laboratory;

    Chemical Sciences Division Lawrence Berkeley National Laboratory|Department of Nuclear Engineering University of California;

    Chemical Sciences Division Lawrence Berkeley National Laboratory;

    Los Alamos National Laboratory;

    Los Alamos National Laboratory|Department of Chemistry Georgetown University;

    Chemical Sciences Division Lawrence Berkeley National Laboratory;

    Molecular Foundry Lawrence Berkeley National Laboratory;

    Chemical Sciences Division Lawrence Berkeley National Laboratory;

    Department of Chemistry Georgetown University;

    Los Alamos National Laboratory;

    Chemical Sciences Division Lawrence Berkeley National Laboratory;

    Chemical Sciences Division Lawrence Berkeley National Laboratory|Department of Nuclear Engineering University of California;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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