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Triamidoamine thorium-arsenic complexes with parent arsenide, arsinidiide and arsenido structural motifs

机译:三酰胺胺th-砷配合物,具有母体砷化物,砷化物和砷化物的结构基序

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Despite a major expansion of uranium–ligand multiple bond chemistry in recent years, analogous complexes involving other actinides (An) remain scarce. For thorium, under ambient conditions only a few multiple bonds to carbon, nitrogen, phosphorus and chalcogenides are reported, and none to arsenic are known; indeed only two complexes with thorium–arsenic single bonds have been structurally authenticated, reflecting the challenges of stabilizing polar linkages at the large thorium ion. Here, we report thorium parent–arsenide (ThAsH2), –arsinidiides (ThAs(H)K and ThAs(H)Th) and arsenido (ThAsTh) linkages stabilized by a bulky triamidoamine ligand. The ThAs(H)K and ThAsTh linkages exhibit polarized-covalent thorium–arsenic multiple bonding interactions, hitherto restricted to cryogenic matrix isolation experiments, and the AnAs(H)An and AnAsAn linkages reported here have no precedent in f-block chemistry. 7s, 6d and 5f orbital contributions to the Th–As bonds are suggested by quantum chemical calculations, and their compositions unexpectedly appear to be tensioned differently compared to phosphorus congeners.
机译:尽管近年来铀-配体的多键化学有了很大的发展,但涉及其他act系元素(An)的类似络合物仍然稀缺。对于th,在环境条件下,仅报告了与碳,氮,磷和硫属元素化物的几个多重键,而与砷无关。实际上,只有两个带有th-砷单键的配合物已经过结构鉴定,这反映了稳定大ion离子上极性键的挑战。在这里,我们报告了parent的母体砷化物(ThAsH 2 ),–砷化物(ThAs(H)K和ThAs(H)Th)和砷化((ThAsTh)联结,这些联结通过庞大的三酰氨基胺配体得以稳定。 ThAs(H)K和ThAsTh键具有极化的共价or-砷多重键相互作用,迄今仅限于低温基质分离实验,此处报道的AnAs(H)An和AnAsAn键在f嵌段化学中没有先例。量子化学计算表明了7s,6d和5f轨道对Th-As键的贡献,并且它们的组成与磷同类物相比似乎具有不同的张力。

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