Actinyl species, [AnO₂]²⁺, are well-known derivatives of the f-block because of their natural occurrence and essential roles in the nuclear fuel cycle. Along with their nitrogen analogues, [An(NR)₂]²⁺, actinyls are characterized by their two strong trans-An–element multiple bonds, a consequence of the inverse trans influence. We report that these robust bonds can be weakened significantly by increasing the number of multiple bonds to uranium, as demonstrated by a family of uranium(VI) dianions bearing four U–N multiple bonds, [M]₂[U(NR)₄] (M = Li, Na, K, Rb, Cs). Their geometry is dictated by cation coordination and sterics rather than by electronic factors. Multiple bond weakening by the addition of strong π donors has the potential for applications in the processing of high-valent actinyls, commonly found in environmental pollutants and spent nuclear fuels.

中文翻译：

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阐明四（亚氨基）铀酸盐（VI）二价阴离子的键合偏好

in系物种[AnO ₂ ] ²⁺是f嵌段的知名衍生物，因为它们是自然存在的，并且在核燃料循环中具有重要作用。their基与它们的氮类似物[An（NR）₂ ] ^2+一起，具有两个强大的反式-An-元素多重键，这是反式反作用的结果。我们报告说，可以通过增加与铀的多重键的数量来显着削弱这些坚固的键，如带有四个U–N多重键的铀（VI）阴离子系列所证明的那样[M] ₂ [U（NR）₄]（M = Li，Na，K，Rb，Cs）。它们的几何形状是由阳离子配位和空间决定的，而不是由电子因素决定的。通过添加强π供体而使多键弱化具有潜在的潜力，可用于处理通常在环境污染物和乏核燃料中发现的高价act基。