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Tomsk Polytechnic University scientists have obtained a non-covalent organic framework based on zwitter-ion iodonium salts. Iodonium salts were first used as a structural element to create a framework that showed high stability and the possibility of sorption and desorption of water.
Obtaining a non—covalent organic framework is a continuation of the cycle of work on the synthesis of diaryliodonium salts and their application in the chemistry of materials. Scientists of the TPU Research School of Chemical and Biomedical Technologies conduct it together with colleagues from universities in the USA, Great Britain, Spain, Japan, and St. Petersburg. By themselves, iodonium salts are indispensable reagents in the synthesis of complex natural compounds and are used for the functionalization of organic molecules.
To obtain a non-covalent organic framework, a group of scientists synthesized a zwitter-ion iodonium salt. Zwitter-ion compounds differ in that they are generally neutral, but at the same time contain positively and negatively charged fragments. Such a structure allows molecules to "assemble" into supramolecular structures of complex structure, but the formation of porous structures has not yet been detected.
"In our experiment, zwitter-ion iodonium salts acted as donors, or sources of halogen bonds. A positively charged particle of one molecule interacts with a negatively charged fragment of another, forming a polymer spatial structure resembling a honeycomb — a non—covalent organic framework," comments Natalia Soldatova, one of the authors of the article, associate professor of the Research School of Chemical and Biomedical Technologies of TPU.
Non-covalent organic frameworks obtained using zwitter-ion salts have two important properties: stability and ability to reversible sorption. The stability of the frame is provided by halogen bonds.
"Non-covalent organic frameworks based on iodonium salts are promising materials for engineering and technology. The chemistry of these compounds is only at the beginning of its journey, and definitely these developments will attract a lot of attention of researchers," says Pavel Postnikov, project manager, associate professor of the Research School of Chemical and Biomedical Technologies of TPU, about the prospects of the study.
The study was conducted with the support of the Russian Science Foundation in the laboratory "Non-valent interactions in the chemistry of materials", organized with the support of the 220th decree of the Government of the Russian Federation.
The article was published in the journal Chemical Science
PHOTO © Natalia S. Soldatova et al./ Chemical Science, 2022
Source: portal "Scientific Russia" (https://scientificrussia.ru /), sci-dig.ru