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[en] Time-resolved laser-induced fluorescence spectroscopy (TRLFS) revealed that Eu(III) and Cm(III) form two dominant species with the protein α-amylase (Amy): one with the coordination of a single carboxylate group of the protein and the other with three coordinating carboxylate groups.
[en] Stabilities of curium compounds with higher oxidation degrees of curium (Cmsup((5)), Cmsup((6)), Cmsup((7))) have been theoretically compared. Using the correlation between the energies of fsup(n)→fsup(n-d) d-transitions of curium atoms in the corresponding charge states with oxidation potentials (Cmsup((4-5))fsup(6)→fsup(5)dsup(1); Cmsup((5-6))fsup(5)→fsup(4)dsup(1); Cmsup((6-7)) fsup(4)→fsup(3)dsup(1)) it is found that Cmsup((7)) is unstable (Esup(0)(6-7)=2.7V) and Cmsup((6)) is to exist in the solutions: Esup(0)(5-6)=1.5V. At the same time Esup(0)(4-5)=17V, i.e. Cmsup((6)) is more stable than Cmsup((5))
[en] The two faces of curium: The first curium borate has been prepared showing a complex structure with coordination environments for Cm"I"I"I that are found in both Pu"I"I"I and Am"I"I"I borates. Time-resolved laser-induced photoluminescence studies as well as X-ray diffraction experiments show two distinct Cm"I"I"I sites with different coordination environments.
[de]Facettenreiches Curium: Das erste Curiumborat wurde synthetisiert und zeigt eine komplexe Struktur mit Cm"I"I"I-Koordinationsumgebungen, wie sie fuer Pu"I"I"I- und Am"I"I"I-Borate gefunden wurden (siehe Bild). Zeitaufloesende laserinduzierte Photolumineszenzuntersuchungen sowie Roentgenbeugungsexperimente ergaben zwei individuelle Cm"I"I"I-Zentren mit unterschiedlichen Koordinationsumgebungen.
[en] The possibility of reduction of Cm(III) to Cm(II) at a value of the oxidation potential of the system down to -2.9 V was investigated. Investigations of the reduction of Cm(III) with the aid of Pr(II) in a system with molten halides were performed. In this work the distribution of microquantities of curium in a system of molten salts were studied, where praseodymium oxychloride was used as the solid phase, while the melt was a mixture of praseodymium di- and trichloride and strontium chloride. The experimental data showed that in the presence of Pr(II), Cm(III) is reduced to the divalent state: Cm3+ + e- = Cm2+, while the standard oxidation potential E/sub Cm(III)///sub Cm(II)/0 is 0.06 V higher than E/sub Pr(III)///sub Pr(II)/0
[en] The values of standard oxidation potential of Cm3+/Cm2+ couple in the presence of weighed amounts of uranium (10-2 -10-3 mol %) was determined. It is ascertained that in the presence of weighed amounts of U2+ oxidation potential of Cm3+/Cm2+ couple increases by 0.15 V and reaches the value of oxidation potential of U3+/U2+ couple, which is explained by formation of mixed dimers or simplest clusters by curium and uranium
[en] The two faces of curium: The first curium borate has been prepared showing a complex structure with coordination environments for Cm"I"I"I that are found in both Pu"I"I"I and Am"I"I"I borates. Time-resolved laser-induced photoluminescence studies as well as X-ray diffraction experiments show two distinct Cm"I"I"I sites with different coordination environments. (Copyright copyright 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)
[en] A review of the present status of the analyses of the optical spectra of Am and Cm in various oxidation states is given. From these analyses, the magnetic properties of the ground states of these ions can be determined. These predicted values are compared with the various magnetic measurements available