{"title":"Estimation of the Redox Potential of Photoexcited Uranyl Ion","authors":"V. P. Shilov, E. V. Abkhalimov, A. M. Fedoseev","doi":"10.1134/S1066362226030045","DOIUrl":null,"url":null,"abstract":"<p>Spectrophotometric monitoring of the photolysis of 1–3 mM uranyl solutions containing 0.4 mM terbium(III) perchlorate or 0.1 mM silver(I) perchlorate and 1 mM unsaturated phosphotungstate K<sub>10</sub>P<sub>2</sub>W<sub>17</sub>O<sub>61</sub> at pH 2 and below has not revealed the formation of terbium(IV) and silver(II). Because the Tb<sup>IV</sup>L<sub>2</sub>/Tb<sup>III</sup>L (L is unsaturated phosphotungstate anion) and Ag(II)/Ag(I) oxidation potentials are about 2 V, it follows from the experimental data that the *UO<sub>2</sub><sup>2+</sup>/UO<sub>2</sub><sup>+</sup> potential is lower than 2 V. The water oxidation to the ОН radical has not been confirmed. However, it is known from the published data that the photolysis yields Н<sub>2</sub>О<sub>2</sub>. Therefore, it can be stated that the potential of the excited uranyl ion is higher than the potential of the Н<sub>2</sub>О<sub>2</sub>, Н<sup>+</sup>/Н<sub>2</sub>О system, i.e., higher than <i>Е</i><sup>0</sup>(H<sub>2</sub>O<sub>2</sub>, Н<sup>+</sup>/H<sub>2</sub>O (liq.) = 1.763 V.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"68 3","pages":"321 - 325"},"PeriodicalIF":0.9000,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radiochemistry","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S1066362226030045","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
Spectrophotometric monitoring of the photolysis of 1–3 mM uranyl solutions containing 0.4 mM terbium(III) perchlorate or 0.1 mM silver(I) perchlorate and 1 mM unsaturated phosphotungstate K10P2W17O61 at pH 2 and below has not revealed the formation of terbium(IV) and silver(II). Because the TbIVL2/TbIIIL (L is unsaturated phosphotungstate anion) and Ag(II)/Ag(I) oxidation potentials are about 2 V, it follows from the experimental data that the *UO22+/UO2+ potential is lower than 2 V. The water oxidation to the ОН radical has not been confirmed. However, it is known from the published data that the photolysis yields Н2О2. Therefore, it can be stated that the potential of the excited uranyl ion is higher than the potential of the Н2О2, Н+/Н2О system, i.e., higher than Е0(H2O2, Н+/H2O (liq.) = 1.763 V.
期刊介绍：
Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.
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