caa a22 4500 475759184 CHVBK 20180406123545.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/BF02495151 doi (NATIONALLICENCE)springer-10.1007/BF02495151 Uranyl-catalyzed chemiluminescent reaction of U4+ oxidation by dioxygen in aqueous HClO4 solution [Elektronische Daten] [S. Lotnik, L. Khamidullina, V. Kazakov] Chemiluminescence (CL) accompanying the reaction of U4+ with O2 in 0.0004-0.1M HClO4 was studied. It was found that the electron-excited uranyl ion (UO2 2+)* is the CL emitter. The fact that the reaction rate and the CL yield increase as the solution acidity decreases was explained by different reactivities of the U aq 4+ aquation and the products of its stepwise hydrolysis, UOH3+ and U(OH)2 2+, toward O2. Based on the results of analysis of the chain-radical mechanism of the reaction between U4+ and O2, it was concluded that transfer of an electron from the UO2 + ion to the oxidizing agent (a ·OH radical) is the most plausible elementary step of the reaction of (UO2 2+)* formation. It was found that the reaction rate, as well as the CL yield, increase substantially in the presence of uranyl ion. Catalytic action of UO2 2+ was explained by the formation of a UO2 2+·UO2 + complex, which reduces the rate of the UO2 + disproportionation reaction (UO2 + is an intermediate of the reaction and is involved in chain propagation), and by regeneration of the active center, UO2 +, in the reaction of UO2 2+ with U4+. Kluwer Academic/Plenum Publishers, 2000 uranium(IV) nationallicence uranyl ion (UO2 2+) nationallicence complex nationallicence dioxygen nationallicence kinetics nationallicence catalysis nationallicence chemiluminescence nationallicence oxidation nationallicence Lotnik S. Institute of Organic Chemistry, Ufa Research Center of the Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054, Ufa, Russian Federation aut Khamidullina L. Institute of Organic Chemistry, Ufa Research Center of the Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054, Ufa, Russian Federation aut Kazakov V. Institute of Organic Chemistry, Ufa Research Center of the Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054, Ufa, Russian Federation aut Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/9(2000-09-01), 1512-1517 1066-5285 49:9<1512 2000 49 11172 https://doi.org/10.1007/BF02495151 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02495151 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lotnik S. Institute of Organic Chemistry, Ufa Research Center of the Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054, Ufa, Russian Federation aut NATIONALLICENCE 700 1- Khamidullina L. Institute of Organic Chemistry, Ufa Research Center of the Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054, Ufa, Russian Federation aut NATIONALLICENCE 700 1- Kazakov V. Institute of Organic Chemistry, Ufa Research Center of the Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054, Ufa, Russian Federation aut NATIONALLICENCE 773 0- Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/9(2000-09-01), 1512-1517 1066-5285 49:9<1512 2000 49 11172 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer