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Scientists report breakthroughs in transuranium actinide chemical bonds

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Scientists at the University of Manchester have successfully created a superuranium complex in which the central metal (here Neptunium) forms multiple bonds with one other element. Being able to study these binding interactions independently for the first time is an important breakthrough for the purification of nuclear waste.


Report to journal Nature ChemistryThe University of Manchester, the European Commission Joint Research Center Karlsruhe, and a group of researchers at the Los Alamos National Laboratory have successfully prepared and characterized this long-awaited transuranium element. Chemical bond Separable compound scenario.

The study of metal-element multiple bond interactions is a vast study of chemistry, with decades of intensive research that has sought to understand the uses of chemical bonds, reactivity, catalysis, and separation. It is a field. There is great interest in leveraging the understanding of chemical bonds (covalent bonds) in extraction studies, as multiple bonds of actinide elements may inform attempts to separate and purify radioactive waste. Has been done.

However, investigations of multiple bonds of metallic elements are regularly reported and well established throughout the periodic table down to uranium, but the heaviest elements occur naturally in large quantities. The survey includes the transuranium element, which is the element that follows uranium in the periodic table. Neptunium and the like are restricted due to the need to work on such radioactive elements in specialized facilities.

Due to the limited experimental work of transuranium multiple bonds, it is inevitably not possible to convey knowledge from basic research in this area to inform potential separation applications.

In the case of the achieved transuranium element multiple bond chemistry, known examples are more than one to a given transuranium ion to provide sufficient stabilization to allow isolation of those compounds. Includes elemental multiple bonds of. However, the presence of two or more binding elements makes it impossible to study such bindings alone, complicating the analysis. Previously, it was not possible to reliably experimentally confirm or disprove theoretical predictions, as it was not possible to access transuranium complexes with only one multiple bond in an element that was stable enough to separate. .. We are in a relativistic situation.

Researchers have succeeded in preparing a complex containing a neptunium ion that multiple bonds to a single oxygen atom using a specialized handling facility. The secret to success was the careful design of a supporting cage-like organic ligand framework with four stabilized nitrogen donors to protect neptunium oxygen and large silicon-based adjoining groups. connect Enables research alone.

By extending the current study of uranium to neptunium, researchers can make previously impossible comparisons, and surprisingly, the neptunium-oxygen complex is more than the uranium-oxygen complex of the same structure. Was also found to be highly covalent. This is the opposite of prediction, emphasizing the difficulty of making predictions in this area of ​​the periodic table and the importance of experimentally testing them.

Professor Steve Liddle, co-director of the University of Manchester’s Center for Radiochemistry, coordinated the study. He states: “The talent of the researchers involved in this research and the cooperation of international professional institutions have made this research possible.

“This was a difficult task to do experimentally. In fact, it would not have been possible without the three major institutions combining our strengths and adopting an interdisciplinary research approach, but this task is already predictable. It was essential to do because it emphasizes that can easily collapse. This complex area of ​​the periodic table. Therefore, this is Experimental work It tests the theory and provides benchmarks to move this field forward. “

The chemistry of molecular uranium and thorium has made great strides in recent years through the study of multiple bonds of metallic elements, but the science of ultra-uranium elements is far behind due to the challenge of experimentally treating these elements. I am.Researcher’s jobs It shows that transuranium analogues will be available for a wider range of studies, opening up opportunities to grow this new field of actinide science.


Actinide Metals-A Breakthrough in Metallic Bonding


For more information:
MichałS. Dutkiewiczetal, terminal neptunium (V) -mono (oxo) complex, Nature Chemistry (2022). DOI: 10.1038 / s41557-021-00858-0

Quote: Scientists have obtained a transuranium actinide chemical bond (2022 2) obtained on February 15, 2022 from https: //phys.org/news/2022-02-scientists-breakthrough-transuranium-actinide-chemical.html. Report the breakthrough (15th of March)

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Scientists report breakthroughs in transuranium actinide chemical bonds

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