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Information × Registration Number 0225U004374, (0124U005059) , R & D reports Title Functionalized fluorescent organogels for detection, accumulation and monitoring of radionuclides and ecotoxic metals popup.stage_title Хімічне модифікування полімерних матриць флуоресцентними лігандами Head Roshal Oleksandr D., Доктор хімічних наук Registration Date 03-12-2025 Organization V.N. Karazin Kharkiv National University popup.description1 Creation of a new class of sorbents - fluorescent organogels for the concentration of dispersed elements with the aim of using them to assess environmental pollution with trace elements, radionuclides and ecotoxic metals as a result of military operations. popup.description2 The report contains the results of the second stage of the project “Functionalized fluorescent organogels for detection, accumulation and monitoring of radionuclides and ecotoxic metals”. As a result of the second stage of the project, methods of chemical modification of the polymers by flavonols were developed using the direct esterification reaction. Synthetic polymers, which were used as matrices are polyacrylic acid and a copolymer of polyacrylic acid and polyacrylamide, as well as a natural polymer-polysaccharide – alginic acid. To study the conditions of the esterification reaction, two model flavonols were used – 7-hydroxyflavonol and 4'-hydroxyflavonol. The most effective solvent system was found – dioxane-water, which allows the polymer to be completely dissolved. The selection of the ratio of components showed that the best results in terms of dissolution and the highest efficiency of grafting flavonols (70-75% and 80-82% substitution of carboxyl groups, respectively for 7-hydroxyflavonols and 4’-hydroxyflavonols) are observed at a solvent ratio of dioxane to water 2:1. The spectral properties of the modified polymers and their gels were investigated using IR, electron absorption and fluorescence spectroscopy methods. The swelling characteristics of modified gels in aqueous solutions were studied, as well. In order to prepare for the next stage of the project, changes in the spectral properties of the gels in the presence of rare-earth metal ions were previously investigated. Product Description popup.authors Oleksandr Roshal Krasnop'orova Alla Petrivna Yukhno Halyna D. Hladkov Yevhen S. Chepeleva Liudmila V. Demidov Oleksii O. popup.nrat_date 2025-12-03 Close