Theoretical Study of the Microhydration of Mononuclear and Dinuclear Uranium(VI) Species Derived from Solvolysis of Uranyl Nitrate in Water

0353057 - ÚFCH JH 2011 RIV US eng J - Journal Article
Ončák, Milan - Schröder, Detlef - Slavíček, Petr
Theoretical Study of the Microhydration of Mononuclear and Dinuclear Uranium(VI) Species Derived from Solvolysis of Uranyl Nitrate in Water.
Journal of Computational Chemistry. Roč. 31, č. 12 (2010), s. 2294-2306. ISSN 0192-8651. E-ISSN 1096-987X
R&D Projects: GA ČR GA203/08/1487; GA ČR GA203/09/0422
Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z40550506
Keywords : density functional thoery * ion association * metal hydration
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 4.050, year: 2010

The structures and energetics of mononuclear and dinuclear uranium species formed upon speciation of uranyl(VI) nitrate, UO2(NO3)(2), in water are investigated by quantum chemistry using density functional theory and the wavefunction-based methods (MP2, CCSD, CCSD(T)). We provide a discussion of the basic coordination patterns of the various mono- and dinuclear uranyl compounds [(UO2)(m)(X,Y)(2m-1)(H2O)(n)](+) (m = 1, 2; n = 0-4) found in a recent mass spectrometric study (Tsierkezos et al., Inorg Chem 2009, 48, 6287). The energetics of the complexation of the uranyl dication to the counterions OH- and NO3- as well as the degradation of the dinuclear species were studied by reference to a test set of 16 representative molecules with the MP2 method and the B3LYP, M06, M06-HF, and M06-2X DFT functionals. All DFT functionals provide structures and energetics close to MP2 results, with M06 family being slightly superior to the standard B3LYP functional.
Permanent Link: http://hdl.handle.net/11104/0192403