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Scientists of Tomsk Polytechnic University together with colleagues synthesized a unique molecule of verdazyl-nitroxyl triradical. Only a few research groups in the world were able to obtain molecules with similar properties. The molecule is stable, can withstand high temperatures, and has promising magnetic properties. This is a continuation of the work of scientists in the search for promising organic magnetic materials. The results of the study are published in the Journal of the American Chemical Society (IF: 14.612, Q1).

Magnetoresistive RAM is one of the most promising technologies for storage devices. Now its development is limited, among other things, by the fact that it is not possible to create a magnetic memory cell of a smaller size — due to the effect of spontaneous remagnetization. Single-molecular magnets based on organic compounds do not have this disadvantage: a small number of molecules can already work as a unit of a memory storage device.

"At a certain temperature, a phase magnetic transition occurs, a consistent orientation of the magnetic vectors of the molecules is observed, as a result, matter becomes a single magnet. Literally 20-40 molecules already form a micromagnet. Our goal in this study was to create a molecule that would exhibit its magnetic properties at high temperatures, be crystalline, and have a small distance between the radical centers, " explains Pavel Petunin, co-author of the paper, associate professor at the Research School of Chemical and Biomedical Technologies at TPU.

When creating the molecule, the scientists worked with three radical centers in one molecule, combining them in one conjugated structure. For the synthesis, the scientists used a palladium-catalyzed reaction of a verdazyl radical with a gold complex of a nitronyl-nitroxyl radical. The reaction is complicated by the presence of unpaired electrons in the initial compounds, as well as the combination of three radical centers in one molecule, which affects its stability. According to scientists, there are no other ways to synthesize the molecule.

A team of scientists from Tomsk Polytechnic University, Novosibirsk Vorozhtsov Institute of Organic Chemistry SB RAS, N. D. Zelinsky Institute of Organic Chemistry RAS, V. V. Voevodsky Institute of Chemical Kinetics and Gorenje RAS and the International Tomographic Center SB RAS worked on the synthesis of the molecule. The study was carried out within the framework of the Russian Science Foundation project No. 20-73-00236 "Stable organic radicals as promising building blocks for new materials".

"The published scientific work not only makes a significant contribution to the development of the direction of stable verdazyl radicals, it is also a significant publication for TPU. The research teams of the Research School of Chemical and Biomedical Technologies fully confirm the mission that was defined at the time of the school's creation. The Journal of the American Chemical Society is the most authoritative journal in the field of chemistry. Research teams around the world are eager to publish in this journal. It is worth noting that this is a series of works from the research team: Recently, the authors published their work in the equally highly rated journal Angewandte Chemie (IF: 12.959, Q1)," says Marina Trusova, Director of the Research School of Chemical and Biomedical Technologies.

Now the researchers have come to the border of complex molecules and plan to synthesize almost impossible molecules-heterospin and high-spin dendrimers.

Information provided by the press service of Tomsk Polytechnic University

Photo source: https://news.tpu.ru/news/2021/06/21/38638/

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