Prof.
nadia ouddai
(univ Hadj-Lakhdar batna Algeria)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
The actinides triflates are formed from a central metal that relates to the ligands (CF3SO3-). The transition metal triflates (trifluoromethanesulfonates) are much considered as Lewis acid catalysts in a variety of organic reactions, as well as precursors in inorganic and organometallic synthesis. In coordination chemistry, the selective complexation of actinides (ш) over lanthanides (ш) with...
Dr
Oleg Gromov
(Borisovich)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
The formulation of the Mendeleyev's Periodic law says: "Properties of chemical elements and their connections are in periodic dependence..." Therefore, it is possible to define evaluate unknown or by practical consideration inaccessible constants of some connections operating with various constants of similar substances in chemical behavior [1].
Chemical similar substances are connections...
Dr
Atsushi Toyoshima
(Japan Atomic Energy Agency)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
Seaborgium (Sg), element 106, is the third transactinide element placed at the 7th row of the Periodic Table. Similar to its lighter group-6 homologs, Mo and W, Sg is expected to be redox-active in aqueous solutions. Pershina et al. [1] theoretically calculated the redox potentials of various couples of Sg on the basis of its multiple ionization-potentials [2]. They predicted that the redox...
Prof.
Hisaaki Kudo
(Niigata University)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
Gas-phase chemistry is one of the most utilized techniques to study chemical properties of superheavy elements. An adsorption enthalpy of volatile compounds of these elements can be determined with their adsorption-desorption processes on a gas chromatographic column surface. The gas phase chemistry for group 4 elements, Zr, Hf, and Rf has been performed by several groups, and it is reported...
Mr
Yusuke Kaneya
(Graduate School of Science and Engineering, Ibaraki University / Japan Atomic Energy Agency)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
The first ionization potential (IP) directly reflects a valence electronic configuration influenced by relativistic effects which are significantly noticeable for heavy elements. Information on IP of heavy elements, therefore, gives us a better understanding of relativistic effects. IPs of heavy actinides with atomic number Z > 100, however, have not been measured by conventional techniques,...
Dr
nadjia latelli
(chemistry)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
In the present study we analyze the reaction mechanisms involved by Xanthates (SA(C@S)AO) and Thiocarbonates
(OA(C@S)AO) compounds in a reversible addition fragmentation chain transfer (RAFT) polymerization.
For the purpose, theoretical calculations have been performed by means of density functional
theory (DFT), using the B3LYP, M06, CAM-B3LYP, LC-xPBE exchange correlation functionals and...
Mr
H. V. Lerum
(Chemistry Department - University of Oslo), Dr
Mohamed F. Attallah
(Chemistry Department, University of Oslo, Norway)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
Element 106, seaborgium (Sg) is a group-6 element with the lighter homologs tungsten (W) and molybdenum (Mo). The homologs have several stable oxidation states in aqueous solutions. Therefore, one can empirically expect that Sg should exhibit similar properties. In addition, theoretical estimates of redox potentials of group-6 elements show that Sg can be reduced from the most stable...
Mr
Aleksandr Vasiliev
(Moscow State University)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
A.N. Vasiliev1,2, N. L. Banik1, R. Marsac1, C. M. Marquardt1, S. N. Kalmykov2
1Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, 76021 Karlsruhe, Germany
2 Lomonosov Moscow State University, Department of Chemistry, 119991 Moscow, Russia
Np-237 is one of the important contributors to the radiation inventory of nuclear waste repositories over a very long time period,...
Mr
Yuriy Demidov
(PNPI)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
Recent advances in first-principle based studies of superheavy element (SHE) chemistry using the new accurate small-core pseudopotential model are summarized. This model accounts for the finite nuclear size and effectively incorporates most relativistic effects described by the all-electron Dirac—Coulomb—Breit model (including the bulk of Breit interactions) and enables explicit correlation...
Ms
Kseniya Chaplieva
(Aleksandrovna)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
A new method of synthesis of schoepite [(UO2)8O2(OH)12](H2O)12(UO3•2.25H2O) has been proposed in this work. Dehydration process of the synthesized compound has been studied, the state and role of H2O in the structure has been established by mean of high-temperature X-ray diffraction, IR spectroscopy and thermography. The transformation processes of schoepite in other forms of the hydrated...
Ms
Elena Kostrova
(Leonidovna)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
In this work, a method of synthesis of lithium triuranate hexahydrate Li2U3O10⋅6H2O is described. The chemical and functional composition of this compound has been investigated; its crystallographic characteristics have been determined; the state of Н2О and its role in the formation of the structure have been studied.
Synthesis of the investigated compound is а reaction of shoepita...
Ms
Anna Eremina
(Alekseevna)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
The state of uranyl vanadates with formula Ak(VUO6)k*nH2O (Ak –elements of the I-III groups of Periodic system) was investigated in aqueous solutions.
The study of these compounds are interested because of their low soluble in aqueous solutions and the compounds are likely to form at the contact with the nuclear waste in the environment, therefore Ak(VUO6)k*nH2O can be used to bind uranium....
Dr
Konstantin Dvoeglazov
(JSC "VNIINM")
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
At present, as one of the promising methods of preparation Pu and Np ions valences in aqueous SNF reprocessing technology, a method using organic reagents (substituted hydrazine, hydroxylamine and carbamide, oximes, etc.) is considered. Many of these compounds reduce Pu (IV) and Np (VI) ions quickly and also are effective stabilizers of formed Pu (III) and Np (V) ions in a nitric acid...
Mr
Jakub Visnak
(Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
This theoretical study of several possible complex species of the general formula ([UO$_2$(H$_2$O)$_a$($\eta^1$-SO$_4$)$_b$($\eta^2$-SO$_4$)$_c$]$^{2-2(b+c)}, 0 ≤ b + c ≤ 4, 5 ≤ a + b + 2c ≤ 6, [UO$_2$(H$_2$O)$_2$($\eta^1$-SO$_4$)($\eta^2$-SO$_4$)]$^{2-}$ depicted at the Fig. 1.) aspires to the theoretical prediction of stability constants $\beta$°, thermodynamical properties (i.e. $\Delta$G°...
Dr
Sergey Vinokurov
(Vernadsky Institute RAS)
5/13/14, 5:15 PM
Chemistry of Actinide and Trans-actinide Elements
Poster
Modern nuclear power engineering is focused on the use of fast neutron reactors (FNR). These reactors run on the mixed uranium-plutonium oxide fuel (MOX) and allow one both to use weapon-grade plutonium as a fuel and to transmute formed long-lived actinide isotopes.
In this connection there arises the problem of a creation of economically effective and environmentally acceptable technology of...
